[SOLVED?] org.glassfish.jersey.media.sse.OutboundEvent errors when using BasicUI

… and i cant seem to find the cause for the “e.internal.WriterInterceptorExecutor/MessageBodyWriter” to do something.

my system is doing normal stuff like processing temperature updates.

2019-12-31 10:09:05.118 [vent.ItemStateChangedEvent] - network_pingdevice_04d7542d_latency changed from 184.0 to 2064.0

2019-12-31 10:09:05.133 [vent.ItemStateChangedEvent] - network_pingdevice_04d7542d_lastseen changed from 2019-12-31T10:08:02.992+0100 to 2019-12-31T10:09:05.107+0100

2019-12-31 10:09:07.083 [vent.ItemStateChangedEvent] - Temperature_Kaum_ZR changed from 8.2 to 8.3

2019-12-31 10:09:07.087 [vent.ItemStateChangedEvent] - jeelink_lacrosse_28_temperature changed from 8.2 °C to 8.3 °C

2019-12-31 10:09:25.810 [vent.ItemStateChangedEvent] - systeminfo_computer_openHABianPi_cpu_uptime_inhours changed from 59.4 to 60.4

==> /var/log/openhab2/openhab.log <==

2019-12-31 10:10:00.961 [ERROR] [e.internal.WriterInterceptorExecutor] - MessageBodyWriter not found for media type=text/event-stream, type=class org.glassfish.jersey.media.sse.OutboundEvent, genericType=class org.glassfish.jersey.media.sse.OutboundEvent.

==> /var/log/openhab2/events.log <==

2019-12-31 10:10:00.970 [vent.ItemStateChangedEvent] - Temperature_Kaum_HT changed from -1.1 to -1.0

2019-12-31 10:10:00.986 [vent.ItemStateChangedEvent] - jeelink_lacrosse_56_temperature changed from -1.1 °C to -1.0 °C

2019-12-31 10:10:01.220 [vent.ItemStateChangedEvent] - network_device_192_168_5_1_time changed from 11.0 to 17.0

2019-12-31 10:10:01.715 [vent.ItemStateChangedEvent] - network_pingdevice_c038870b_lastseen changed from 2019-12-31T10:09:01.591+0100 to 2019-12-31T10:10:01.681+0100

2019-12-31 10:10:02.301 [vent.ItemStateChangedEvent] - jeelink_lacrosse_8_temperature changed from 9.5 to 9.7

2019-12-31 10:10:02.326 [vent.ItemStateChangedEvent] - Temperature_Kaum_WZ changed from 9.5 to 9.7

2019-12-31 10:10:03.370 [vent.ItemStateChangedEvent] - jeelink_lacrosse_11_temperature changed from 9.1 °C to 9.0 °C

Those errors occur around every minute. sometimes half a minute. These are the only errors i get.

thanks already in advance