After upgrading from 3.5 to 5.1.1, I have 2 plugins that show this error:
I've seen this before, and it takes manual manipulation of the database to remove. Connect to your database run this query:
select plugindataid, pluginkey from plugindata;
You should see the .tmp add-on in the output under pluginkey. Note the dataid. Then run this query:
delete from plugindata where plugindataid = <id from query 1>;
You'll need to restart Confluence after this.
The add-on should now be removed from the UPM. You can try adding it again via the web or uploading it manually.
Hope this helps!
I believe the problem might be the plugin not compatible with the newer version of Confluence. I suggest to remove and install the newest version of the plugin again (assuming it has a compatible version between Confluence and the plugin itself) to see if this corrects the issue.
I hope this helps!
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