CAX1MENU library member causes IPT (Data Set Commander) init error

Document ID : KB000113603
Last Modified Date : 25/09/2018
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IPT (Data Set Commander) is experiencing a failure in CAX1MENU library member causing init error initialization.  

Message received ; IQIM100 - READ Unexpected error accessing 'ISPMLIB' library RC = 0002
Fails to get into ISPF .
CAX1MENU needs to be a FIXED block member.  If the library was changed to VB, this error happens.