Openfire 4.7.5 to 4.8.1 Migration & Chat API Plugin is not working

I have been using Openfire 4.7.5 then I switched to the new version, But One of the plugins is not working (Chat API).
I am sending you logs also,
can you please let me know, what the issue is or maybe I did something wrong?
To Solve this, I tried to uninstall the old and again did a fresh version.
Still, problem is the same.
openfire (2).log (119.5 KB)

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