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Hi and thanks for your help.

I was using previous version of Joomla 5. I have just done a couple of updates on some extensions and git this error:
Failed opening required '/home/mysite/public_html/plugins/system/nrframework/j3bc.php' (include_path='.:/opt/alt/php82/usr/share/pear:/opt/alt/php82/usr/share/php:/usr/share/pear:/usr/share/php')

How can I find out which extension caused it and can I reverse it? I don't have access to my site since. I found this suggestion but don't want to try it if I can further damage the site.
https://docs.joomla.org/J4.x:FatalError

Thanks very much.

The error already shows the cause: /plugins/system/nrframework/

You can disable that plugin in the database in the #__extensions table. Search that plugin, change "enabled" from 1 to 0.
Or use FTP and rename nrframework to something else so that Joomla cannot load the plugin anymore.

The error already shows the cause: /plugins/system/nrframework/

You can disable that plugin in the database in the #__extensions table. Search that plugin, change "enabled" from 1 to 0.
Or use FTP and rename nrframework to something else so that Joomla cannot load the plugin anymore.

Thank you very much. For a start I will rename nrframework. Thanks again.

nrframework (novarain framework) is used by Tassos Marinos' extensions.

Do you use Convert Forms or similar? (This is about the 3rd or 4th post I've seen about this problem in the last week, involving this extension and a user migrating 4.x to 5.x).