SymptomsWhen you go to Clients -> client name -> Preferences -> and enable "Create a corresponding user account in Sitebuilder" option you receive the following error:
Warning: The following error occured in Sitebuilder:
Action has been failed. Invalid plan ID. Invalid plan ID.
CauseSitebuilder plan for all users creating from Parallels Plesk Control Panel is missing.
ResolutionLog into Plesk database and perform following action:
mysql> delete from psa.SBConfig where param_name='plan';
Query OK, 1 row affected (0.05 sec)
and re-activate Sitebuilder support in Plesk.
For this you need visit Parallels Plesk Control Panel -> Server -> Sitebuilder Support -> click "Ok" button. This will recreate the plan and allow to activate Sitebuilder for clients and their domains.