Event Code UE-0304-E

Hi all,

I am using P6 v8.3 PPM and when working in the resource window receive the event code UE-0304-E. I cannot find this code on the knowledge base, does anyone know what error is for this code? When it starts occurring the line items in my resource window start disappearing and when I click on another icon the code will reappear until I close out of the software. Any help would be greatly appreciated!

Thank you!!