CO88 settlement in background with spool error .

Dear SAP Experts ,

After settlement of Process orders through CO88 in background during our month end closure, in SPOOL request system result is showing message u201CProcessing completed with no errorsu201D

but in Processing cateogry ,the error are showing as 3 no's with out any error message.

How can i find the errors , or does it relates to technical errors. can any one help me to fix this .

Thanks

Partha