getting DfTypedObjectException while gettin a workflow

hi, i am trying to get a workflow as below:

IDfId WIIdfId=colSorunlu.getId("p1");//this works like a charm

IDfWorkflow oWF = (IDfWorkflow) session.getObject(WIIdfId);//it gives exception here

exception is:

DM_API_E_BADATTRNAME]error: "Bad attribute name 'int_value' for document/object."

do you have any idea what the problem is?

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Please print out value of WIIdfId to verify that its valid workflow object ID.

thank you for your reply.yes i watched the value it has no problem.it is:4d02372980006545 there is not any space character in the value.