It sounds that you will have to follow item 2 below unless you find out something else.
1---- This article may help you:
https://comm.support.ca.com/kb/Random-1ICSCMSGP06T-INTERR-IO-ERROR-WHILE-ACCESSING-MESSAGE-LIBRARY-1IDADERRP23-message-and-how-to-fix-it/KB000014558 2---- Also have a look at documentation for SRVC=VLS FUNC=INIT RC=004-12:
https://docops.ca.com/ca-datacom-messages/en/ca-ipc-messages/vls-auxiliary-return-codes/12-x-0c It is about VLS function INIT with an auxilliary return code 12.
Reason: The first block of the online library has an invalid format.
Action: Try again. A recurrence of this error means that the library was destroyed. To recover the library, ask your Site Administrator to restore it from a backup file. If this library was a new on-line library, reformat it.
3---- Note that meaning of IDADERRP11 says the same thing.
Reason: The first block of a VLS library has an invalid format. If the problem persists, it indicates that the library was destroyed.
AND you will have to recycle your CICS for the new Library to be on line