problem in simple filetofile scenario with BPM

Hi

I am a starter to XI. I am implementing simple file2file scenario with BPMs.

But I am getting error while looking into SXMB_MONI.

Under "Monitor for Processed XML messages"

Number of XML message Found 3 (which is my input 3 xmls which is fine) but

"Status is RED Flag".

"Error Category: BPE_ADAPTER"

"Error ID: UNKNOWN_MESSAGE".

Please help me out with this problem.

Regards

Sam