[SOLVED] MQTT 2.4 setup problem - mix of GUI/textfile configuration problem

[lipp_markus]

Mixing text based and PaperUI based definitions can easily go wrong, would suggest you try either or.
Maybe easiest to delete your thing in PaperUI

In addition try clearing out the cache:

Clear the Cache

Often when one encounters a problem with OH, particularly after an update, OH will refuse to run or certain parts of OH stop working. Some reported errors include: 500 or 404 errors when accessing the UIs lots of exceptions from Jetty or other core components in openhab.log OH refuses to start at all The first step in debugging the problem is to clear the tmp and cache. Installed OH If you are running an installed OH (openHABian, installed using apt or yum): openhab-cli stop openhab-cl…