[Windows Server 2008] The description for Event ID 0 from source AtBroker cannot be found

Hi @ all:

I've got the following warnings in the Applicationlog of my Windows Server 2008:

Log Name:      Application
Source:        AtBroker
Date:          3/23/2010 9:10:24 AM
Event ID:      0
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      phoenix.bluestep.local
Description:
The description for Event ID 0 from source AtBroker cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event:

GetSessionValue Failed to Open session value return error 2

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="AtBroker" />
    <EventID Qualifiers="0">0</EventID>
    <Level>3</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-03-23T08:10:24.000Z" />
    <EventRecordID>1560</EventRecordID>
    <Channel>Application</Channel>
    <Computer>phoenix.bluestep.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>GetSessionValue Failed to Open session value return error 2</Data>
  </EventData>
</Event>

So I've searched the net to find the description of that EventID, but i didn't find anything which describes me neither what this warning means nor how i can resolve this.

I think that warning is the reason why the Keyboard on of that Server doesn't work.

I hope someone can help me.

Best regards

Markus