Phpmyadmin showing blank page after upgrading to lightspeed enterprise

I upgraded to open lightspeed enterprises then I reverted back to openlightspeed. but after that phpmyadmin page not showing. How can I take a backup from command line.

i tried this ```
mysql -u [user] -p [database_name] < [filename].sql

but showing error like - mysqldump: Couldn't find table: "pust_active"

please help me to get the database back

Update your cyberpanel once

updated but not working