0A0

Explanation
During initial program load (IPL), an error occurred
while the system was starting the master scheduler. Register 15 contains
a hexadecimal reason code: Code
Explanation
01
The system detected a converter, interpreter, or system error
during master scheduler initialization.
02
The system detected an allocation error, an OPEN catalog error,
or a locked catalog error during master scheduler initialization.
03
The system could not obtain a special region for the master scheduler.

System action
The system does not start the master scheduler.
System initialization ends. The system writes an SVC dump. The system
may issue message IEE479W.

Operator response
If the system issues message IEE479W, see
the operator response for message IEE479W.  Otherwise, notify the
system programmer.

System programmer response
Examine the SVC dump, looking at the
master trace table for messages which will pinpoint the problem with
the JCL (for RC=01) or with allocation (for RC=02). If the master
JCL data set (MSTJCLxx) was updated recently, check
that the changes are correct. The messages associated with the processing
of MSTJCLxx are sent to the console if you specify
the L option (,L) on the MSTRJCL system parameter. Respond to messages
issued by the converter, interpreter, or allocation.
If the
problem recurs and if the program is not in error, search problem
reporting data bases for a fix for the problem. If no fix exists,
contact the IBM® Support Center.
Provide the dump.

Source
Initiator/terminator