An EXEC CICS® FEPI ALLOCATE POOL or ALLOCATE PASSCONVID command has failed. The most likely cause of this error if you are attempting to acquire ownership of an existing unowned conversation, ALLOCATE PASSCONVID, is that the conversation Id is not known or the conversation has been lost. When attempting to establish a new conversation with a target application, ALLOCATE POOL, the most likely reason this message will occur is the POOL or TARGET or both are unavailable, not known or there is no session available and in service.
Dump the error log (DFHMAERF) to determine the problem. Check to see if the POOL or TARGET or both are defined, installed and in service. Also check to see if there are available in service sessions for the defined TARGET.