Eventlog ID: 5244 Excel Services Problem

Dear All

I have an Eventlog Errormessage that I cannot resolve. The strange thing is, that I cannot found a problem with the excel service itself. Also it not appears during a crawl or another known scheduled tasks.

Our Environment is a full virtual SharePoint 2010 SP1 Enterprise Server with 2 Front End Servers and one SQL 2008 R2 Server.

Event ID: 5244
Source: Excel Services Application
User: Service User responsible for Application Pool for Excel Services

Message:
Unexpected error when trying to access service settings in the configuration database. Make sure the proxy for this service application is a member of the default proxy group for the active web application.Error = The SharePoint farm has not been provisioned properly..

Date Time this message last time occurs:
29.01.2013 - 05:22:32
29.01.2013 - 08:24:02
30.01.2013 - 05:42:42
30.01.2013 - 10:01:05
30.01.2013 - 19:56:05

I have found similar forum posts, but not one with the "Error = The SharePoint farm has not been provisioned properly.."
I already tried to run the SharePoint 2010 Products Configuration Wizard. This runs to the end without any problems.

Do you have any ideas how to resolve this?