Why am I getting a CEE3250C, and then the system or user abend U1215 R=NULL?

Document ID : KB000016651
Last Modified Date : 14/02/2018
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Introduction:

Upgrading to to  IMS v14 

Question:

Why am I getting a CEE3250C, and then the system or user abend U1215 R=NULL?     

Environment:
Upgrade to IMS v14
Answer:

We have found the v9 File Master Plus for IMS load modules were concatenated above File Master Plus for IMS v10 load modules, which caused the problem.

Additional Information:

The U1215 means that the call to authorized module CAWKGRBA failed. They’re running with an old CAWKGRBA. They should verify that the CDBIAUTH library (from which CAIRIM should load CAWKGRBA) was updated as part of applying maintenance. 

The CAIRIM refresh must be done to reload CAWKGRBA