please need help with cube processing error

Hi,

I'm processing a CUBE and i'm getting the following error:

"Errors in the OLAP storage engine: The attribute key cannot be found: Table: Permit_x0020_FACTS, Column: CaseStatus, Value: Collections. Errors in the OLAP storage engine: The attribute key was converted to an unknown member because the attribute key was not found. Attribute Case Statuses of Dimension: Case Statuses from Database: ACCELA Performance Reports, Cube: Permits, Measure Group: Permit FACTS, Partition: Permit FACTS, Record: 320702.

But when i processed the PERMITS_FACT individually, it was a success, please need advice as why this FACT table is failing in the CUBE and not individually?

Thanks