Modality Worklist CFindSCP

[Mounir Boussetta]

I'm implementing a the CFindSCP of dcm4che2, and I'm testing the modality worklist with a modality emulator (DVTK), when I make a cfind request the association is done and the attributes to be returned are built in workitems that I can see in the log, but the modality show me the following error :

No workist items received from MWLSCP due to object reference not set to an instance

Where would be the problem?

Thanks.