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Users disconnected after sending message

Hello, we have recently run into an issue where users are getting disconnected from Spark/the server after sending a message in a group chat; some when sending messages to another individual. Their directory is then stuck in a spinning "reconnecting " phase.

The error message in our logs is:

java.lang.IncompatibleClassChangeError: Found class org.jivesoftware.openfire.muc.MUCRoom, but interface was expected

I suspect that you have at least one plugin that needs updating (likely the Monitoring plugin). When you do that, this problem will disappear.

That seems to be the solution. We had two plugins that needed to be updated. Thank you so much!

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Good Morning! I solved it by removing the monitoring plugin, stopping Openfire and after starting Openfire again, I installed the plugin in question.

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