Migration check in plesk shows this error:
The ‘max_allowed_packet’ parameter on the source database server is 16777216, which is bigger than on the destination server, where it is 1048576
RDP the the server. The file is at C:Program Files (x86)ParallelsPleskDatabasesMySQLDatamy.ini
Add this to it:
[mysqld] # max_allowed_packet=16M