I get an error "Error Occurred, An error when processing the request"

I get an error "Error Occurred, An error when processing the request"

Hi,
 
I get an error "Error Occurred, An error when processing the request"
I get it specific on generating a custom report
 
When I want to Generate a User Audit Report
I want to filter on:
- Column Name: Username
- Criteria: from user group
- Value: <one of my user groups>
 
What am I doing wrong.
All other eports work fine, also user audits based on other criteria filters.
 
I have working Build 6900
 
Regards
 
Paul
 

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