I have the latest binding installed through Paper UI. This error pops up often. I believe it happens when I’m using the TTS feature to make OpenHAB speak. But it is intermittent so hard to say for sure.
2019-01-21 16:16:33.147 [ERROR] [nal.common.AbstractInvocationHandler] - An error occurred while calling method 'ThingHandler.handleCommand()' on 'org.openhab.binding.amazonechocontrol.internal.handler.EchoHandler@25b05c': POST url 'https://alexa.amazon.com/api/behaviors/preview' failed: Bad Request
org.openhab.binding.amazonechocontrol.internal.HttpException: POST url 'https://alexa.amazon.com/api/behaviors/preview' failed: Bad Request
at org.openhab.binding.amazonechocontrol.internal.Connection.makeRequest(Connection.java:549) ~[?:?]
at org.openhab.binding.amazonechocontrol.internal.Connection.executeSequenceNode(Connection.java:1067) ~[?:?]
at org.openhab.binding.amazonechocontrol.internal.Connection.executeSequenceNodes(Connection.java:1076) ~[?:?]
at org.openhab.binding.amazonechocontrol.internal.Connection.textToSpeech(Connection.java:1038) ~[?:?]
at org.openhab.binding.amazonechocontrol.internal.handler.EchoHandler.startTextToSpeech(EchoHandler.java:640) ~[?:?]
at org.openhab.binding.amazonechocontrol.internal.handler.EchoHandler.handleCommand(EchoHandler.java:527) ~[?:?]
at sun.reflect.GeneratedMethodAccessor83.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.internal.common.InvocationHandlerSync.invoke(InvocationHandlerSync.java:59) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at com.sun.proxy.$Proxy128.handleCommand(Unknown Source) [210:org.openhab.binding.amazonechocontrol:2.4.0]
at org.eclipse.smarthome.core.thing.internal.profiles.ProfileCallbackImpl.handleCommand(ProfileCallbackImpl.java:75) [109:org.eclipse.smarthome.core.thing:0.10.0.oh240]
at org.eclipse.smarthome.core.thing.internal.profiles.SystemDefaultProfile.onCommandFromItem(SystemDefaultProfile.java:49) [109:org.eclipse.smarthome.core.thing:0.10.0.oh240]
at sun.reflect.GeneratedMethodAccessor82.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:53) [102:org.eclipse.smarthome.core:0.10.0.oh240]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]