i am not able to create user in the potal

Hi,

when i click on the create user tab .. this is the message what i am getting.

Current user has user creation permissions in the UME, but cannot create users in the back-end system (data source). The original and possibly untranslated message was: "No active writeable datasource found for user creation, check your Persistence Configuration.".

thanks in advance

Sathish Kumar T.