Error validating plugin. Please remove the older plugin and do a fresh install

Hello Support team and MigrateGuru fans ??

I am using MigrateGuru and I am having problems. I am getting the error message “Error validating the plugin. Please remove the older plugin and reinstall”.

What could be the reason? I use the same current WordPress release on both sites (source and target). What could be the reason for this problem? And how can I fix it?

Best regards