Issue Loggining in into Plesk 8.1 - error - "component_name__ws (not configured)"

[Elena Powe]

Hello.

I have installed a new SQL server - MySQL 5.1.32.
I have successfully rebooted my server.
Plesk has initially worked.
Then suddenly I can't login into Plesk anymore.
Get the following message:

"Selecting Default Components
component_name__ws
(not configured)
* Required fields"

Please help me with thorough instructions on what to do.

Many thanks!