Well, that what I would do but if you're not experienced, best is to do as follows, keeping your current i-MSCP version:
- Drop the imscp_roundcube database: drop database imscp_roundcube
- Delete the RoundcubePlugins plugin data from the i-MSCP plugin database: use imscp; delete from plugin where plugin_name = 'RoundcubePlugins';
- Remove the RoundcubePlugins plugin file: rm -r /var/www/imscp/gui/plugins/RoundcubePlugins
- Trigger an i-MSCP reconfiguration (that will re-install Roundcube): perl /var/www/imscp/engine/setup/imscp-reconfigure -dnv
- Install the RoundcubePlugins plugin (last version from our plugin store)
I followed the steps you mentioned, and everything was perfect ..!
No errors, and everything returns to normal.
Thank you very much for your help and for the excellent work you do with this magnificent panel.