The callable service BPX1PTJ was called by the Language Environment internal join service CEEOPJ to wait for a thread to terminate. However, BPX1PTJ returned without waiting because the ID of the target thread specified on the join request was invalid. The return_code and reason_code fields are decimal numbers.
Unless the condition is handled, the default action is to terminate the enclave.
See z/OS UNIX System Services Programming: Assembler Callable Services Reference or z/VM: OpenExtensions Callable Services Reference for the appropriate action to take for this return code and reason code. Consult with your system support personnel if necessary.
CEE5F6