I’m trying to get a Telegesis ETRX3 Dongle up and running on my RPi3 running openhabian 2.4. Discovery goes just fine. I set the port to /dev/ttyAMA0 as returned by:
dmesg | grep tty
The baud rate is 57600
I put org.openhab.binding.zigbee.telegesis and org.openhab.binding.zigbee into DEBUG mode and here is the output I get:
2019-05-26 09:07:39.916 [DEBUG] [org.openhab.binding.zigbee.telegesis] - ServiceEvent UNREGISTERING - {org.eclipse.smarthome.core.thing.binding.firmware.FirmwareUpdateHandler}={service.id=442, service.bundleid=242, service.scope=singleton} - org.openhab.binding.zigbee.telegesis
2019-05-26 09:07:44.360 [INFO ] [g.discovery.internal.PersistentInbox] - Added new thing 'zigbee:coordinator_telegesis:04000A8E' to inbox.
2019-05-26 09:07:44.371 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F000E0587CC: Discovery: Starting discovery for existing device
2019-05-26 09:07:44.374 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - F0FE6B001400BE0D: Discovery: Starting discovery for existing device
2019-05-26 09:07:44.380 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F0010C0CD47: Discovery: Starting discovery for existing device
2019-05-26 09:07:44.384 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - Starting ZigBee scan for zigbee:coordinator_ember:19b1e69a
2019-05-26 09:07:44.384 [INFO ] [bee.discovery.ZigBeeDiscoveryService] - 000D6F000E0587CC: Starting ZigBee device discovery
2019-05-26 09:07:44.387 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - ZigBee coordinator is offline - aborted scan for zigbee:coordinator_ember:19b1e69a
2019-05-26 09:07:44.388 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F000E0587CC: Creating ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a
2019-05-26 09:07:44.392 [INFO ] [bee.discovery.ZigBeeDiscoveryService] - F0FE6B001400BE0D: Starting ZigBee device discovery
2019-05-26 09:07:44.395 [INFO ] [bee.discovery.ZigBeeDiscoveryService] - 000D6F0010C0CD47: Starting ZigBee device discovery
2019-05-26 09:07:44.398 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - F0FE6B001400BE0D: Creating ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a
2019-05-26 09:07:44.399 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F0010C0CD47: Creating ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a
2019-05-26 09:07:44.415 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F000E0587CC: ZigBee node property discovery start
2019-05-26 09:07:44.418 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F000E0587CC: ZigBee node property discovery using 29242/1
2019-05-26 09:07:44.420 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - F0FE6B001400BE0D: ZigBee node property discovery start
2019-05-26 09:07:44.421 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F000E0587CC: ZigBee node property discovery complete: {zigbee_logicaltype=END_DEVICE, zigbee_powerlevel=FULL, modelId=Motion Sensor-A, zigbee_networkaddress=29242, zigbee_powersource=DISPOSABLE_BATTERY, zigbee_stkversion=2, zigbee_datecode=����������������, zigbee_zclversion=1, vendor=CentraLite, zigbee_powermode=RECEIVER_ON_IDLE, zigbee_powersources=[DISPOSABLE_BATTERY], hardwareVersion=1, firmwareVersion=1E005310}
2019-05-26 09:07:44.424 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - F0FE6B001400BE0D: ZigBee node property discovery using 62062/1
2019-05-26 09:07:44.424 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F000E0587CC: Update ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a, label 'CentraLite Motion Sensor-A'
2019-05-26 09:07:44.424 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F0010C0CD47: ZigBee node property discovery start
2019-05-26 09:07:44.428 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - F0FE6B001400BE0D: ZigBee node property discovery complete: {zigbee_logicaltype=ROUTER, zigbee_powerlevel=FULL, modelId=Daylight, zigbee_networkaddress=62062, zigbee_powersource=MAINS, zigbee_stkversion=2, zigbee_datecode=20150515, zigbee_zclversion=1, vendor=GE, zigbee_powermode=RECEIVER_ON_IDLE, zigbee_powersources=[MAINS], hardwareVersion=1, firmwareVersion=02000209}
2019-05-26 09:07:44.432 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - F0FE6B001400BE0D: Update ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a, label 'GE Daylight'
2019-05-26 09:07:44.437 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Start.
2019-05-26 09:07:44.449 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F0010C0CD47: ZigBee node property discovery using 9043/1
2019-05-26 09:07:44.453 [DEBUG] [scovery.ZigBeeNodePropertyDiscoverer] - 000D6F0010C0CD47: ZigBee node property discovery complete: {zigbee_logicaltype=END_DEVICE, zigbee_powerlevel=FULL, modelId=3328-G, zigbee_networkaddress=9043, zigbee_powersource=DISPOSABLE_BATTERY, zigbee_stkversion=2, zigbee_datecode=����������������, zigbee_zclversion=1, vendor=CentraLite, zigbee_powermode=RECEIVER_ON_IDLE, zigbee_powersources=[DISPOSABLE_BATTERY], hardwareVersion=1, firmwareVersion=18005310}
2019-05-26 09:07:44.457 [DEBUG] [bee.discovery.ZigBeeDiscoveryService] - 000D6F0010C0CD47: Update ZigBee device zigbee:device with bridge zigbee:coordinator_ember:19b1e69a, label 'CentraLite 3328-G'
2019-05-26 09:07:44.699 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Done.
2019-05-26 09:07:44.708 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Start.
2019-05-26 09:07:44.914 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Done.
2019-05-26 09:07:44.922 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Start.
2019-05-26 09:07:45.124 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Done.h
2019-05-26 09:08:19.520 [DEBUG] [org.openhab.binding.zigbee.telegesis] - ServiceEvent REGISTERED - {org.openhab.binding.zigbee.handler.ZigBeeCoordinatorHandler}={service.id=443, service.bundleid=242, service.scope=singleton} - org.openhab.binding.zigbee.telegesis
2019-05-26 09:08:19.548 [DEBUG] [org.openhab.binding.zigbee.telegesis] - ServiceEvent REGISTERED - {org.eclipse.smarthome.core.thing.binding.firmware.FirmwareUpdateHandler}={service.id=444, service.bundleid=242, service.scope=singleton} - org.openhab.binding.zigbee.telegesis
2019-05-26 09:08:19.567 [DEBUG] [e.telegesis.handler.TelegesisHandler] - Initializing ZigBee Telegesis serial bridge handler.
2019-05-26 09:08:19.571 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Initializing ZigBee network [zigbee:coordinator_telegesis:04000A8E].
2019-05-26 09:08:19.573 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Channel 0
2019-05-26 09:08:19.576 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - PANID 0
2019-05-26 09:08:19.577 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - EPANID 0000000000000000
2019-05-26 09:08:19.580 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Network Key null
2019-05-26 09:08:19.581 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Link Key null
2019-05-26 09:08:19.584 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Config: zigbee_initialise found, initializeNetwork=false
2019-05-26 09:08:19.586 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - ExtendedPanId or PanId not set: initializeNetwork=true
2019-05-26 09:08:19.589 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Network Key String
2019-05-26 09:08:19.590 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Network Key String has invalid format. Revert to default key.
2019-05-26 09:08:19.593 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Network key initialised 617C95842FBF82ECD1D7CB50AA4FD360
2019-05-26 09:08:19.595 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Network key final array 617C95842FBF82ECD1D7CB50AA4FD360
2019-05-26 09:08:19.597 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Link Key String
2019-05-26 09:08:19.599 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Link Key String has invalid format. Revert to default key.
2019-05-26 09:08:19.601 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Initialising network
2019-05-26 09:08:19.603 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Channel set to 11.
2019-05-26 09:08:19.624 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Created random ZigBee PAN ID [43F2].
2019-05-26 09:08:19.643 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Created random ZigBee extended PAN ID [693BC028325FAA04].
2019-05-26 09:08:19.676 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Link key final array 5A6967426565416C6C69616E63653039
2019-05-26 09:08:19.680 [DEBUG] [e.telegesis.handler.TelegesisHandler] - ZigBee Telegesis Coordinator opening Port:'/dev/ttyUSB0' PAN:43f2, EPAN:693BC028325FAA04, Channel:11
2019-05-26 09:08:19.685 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Scheduling ZigBee start
2019-05-26 09:08:20.689 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - ZigBee network starting
2019-05-26 09:08:20.693 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - Initialising ZigBee coordinator
2019-05-26 09:08:20.704 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Loading ZigBee network state: Start.
2019-05-26 09:08:20.752 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Loading ZigBee network state: Done.
2019-05-26 09:08:20.763 [DEBUG] [ding.zigbee.handler.ZigBeeSerialPort] - Connecting to serial port [/dev/ttyUSB0] at 19200 baud, flow control FLOWCONTROL_OUT_NONE.
2019-05-26 09:08:20.765 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - null: networkStateUpdated called with state=UNINITIALISED
2019-05-26 09:08:20.870 [ERROR] [ding.zigbee.handler.ZigBeeSerialPort] - Serial Error: Port /dev/ttyUSB0 in use.
2019-05-26 09:08:20.872 [ERROR] [ngle.telegesis.ZigBeeDongleTelegesis] - Unable to open Telegesis serial port
2019-05-26 09:08:20.874 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - null: networkStateUpdated called with state=OFFLINE
2019-05-26 09:09:01.096 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - null: Configuration received (Coordinator).
2019-05-26 09:09:01.101 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - null: Configuration update: Processing zigbee_port -> /dev/ttyAMA0
2019-05-26 09:09:01.105 [DEBUG] [bee.handler.ZigBeeCoordinatorHandler] - null: Configuration update: Processing zigbee_baud -> 57600
2019-05-26 09:09:01.153 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Start.
2019-05-26 09:09:01.172 [DEBUG] [nal.ZigBeeNetworkStateSerializerImpl] - Saving ZigBee network state: Done.
2019-05-26 09:09:01.178 [ERROR] [st.core.internal.thing.ThingResource] - Exception during HTTP PUT request for update config at 'things/zigbee:coordinator_telegesis:04000A8E/config'
java.lang.NullPointerException: null
at com.zsmartsystems.zigbee.app.discovery.ZigBeeDiscoveryExtension.extensionShutdown(ZigBeeDiscoveryExtension.java:96) ~[?:?]
at com.zsmartsystems.zigbee.ZigBeeNetworkManager.shutdown(ZigBeeNetworkManager.java:529) ~[?:?]
at org.openhab.binding.zigbee.handler.ZigBeeCoordinatorHandler.dispose(ZigBeeCoordinatorHandler.java:303) ~[?:?]
at org.openhab.binding.zigbee.handler.ZigBeeCoordinatorHandler.handleConfigurationUpdate(ZigBeeCoordinatorHandler.java:554) ~[?:?]
at org.eclipse.smarthome.core.thing.internal.ThingRegistryImpl.updateConfiguration(ThingRegistryImpl.java:91) ~[?:?]
at org.eclipse.smarthome.io.rest.core.internal.thing.ThingResource.updateConfiguration(ThingResource.java:438) [120:org.eclipse.smarthome.io.rest.core:0.10.0.oh240]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [171:org.glassfish.jersey.core.jersey-common:2.22.2]
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [172:org.glassfish.jersey.core.jersey-server:2.22.2]
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
at com.eclipsesource.jaxrs.publisher.internal.ServletContainerBridge.service(ServletContainerBridge.java:76) [20:com.eclipsesource.jaxrs.publisher:5.3.1.201602281253]
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865) [85:org.eclipse.jetty.servlet:9.4.11.v20180605]
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535) [85:org.eclipse.jetty.servlet:9.4.11.v20180605]
at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) [186:org.ops4j.pax.web.pax-web-jetty:7.2.3]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) [82:org.eclipse.jetty.security:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:293) [186:org.ops4j.pax.web.pax-web-jetty:7.2.3]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [85:org.eclipse.jetty.servlet:9.4.11.v20180605]
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) [186:org.ops4j.pax.web.pax-web-jetty:7.2.3]
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.Server.handle(Server.java:531) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [84:org.eclipse.jetty.server:9.4.11.v20180605]
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) [75:org.eclipse.jetty.io:9.4.11.v20180605]
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) [75:org.eclipse.jetty.io:9.4.11.v20180605]
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [75:org.eclipse.jetty.io:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680) [87:org.eclipse.jetty.util:9.4.11.v20180605]
at java.lang.Thread.run(Thread.java:748) [?:?]
In PaperUI, the displays “Offline - Communication error”. How can I fix this?