Submit for Approval throws error

Hi Experts,

we are facing a strange error with the approval workflow. Once the user select "submit for approval" from Details the following error is displayed.

Could not execute command 'com.sapportals.wcm.rendering.uicommand.cm.UIStatemanagementCommand'

Somebody knows how this problem occurs and can be fixed?

Thanks and Regards,

Ingo Taraske