Error at start of CICS TS 5.4

Document ID : KB000096478
Last Modified Date : 16/05/2018
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Introduction:
Upgrade to CICS TS 5.4 with ACF2 16.0
Question:
At start of upgrade to version CICS 5.4 we observed the following error.

+DFHKE1800 CICSUNT1 ABNORMAL TERMINATION OF CICS IS COMPLETE.
BPXP018I THREAD 3838700000000000, IN PROCESS 33554600, ENDED 900 WITHOUT BEING UNDUBBED
WITH COMPLETION CODE 00000708, AND REASON CODE 00000000.
IEF450I CICSUNT1 CICSUNT1 - ABEND=S000 U1800 REASON=00000000 901 TIME=09.06.37

How can we overcome the S000 abend.
Environment:
CICS TS 5.4 / ACF2 16.0
Answer:
Apply RO96890
Product: ACF2 Release: 16.

Title: CICS: SUPPORT CICS TS (CTS) REL 5.4 FOR Z/OS
****************** VERSION 0 EFFECTIVE: JUL 13 2017 13:24 ******************
Product updates are required to support the new release of CICS TS 5.4.
* Support APAR for Level: GA *

In addition to recognizing the new release,                                  
The following new Category 1 transaction codes are recognized:               
CMPE COHT, COIE, COIR, COI0, CONA, COND, CONH, CONL, CONM, COWC,                  
                                                                             
Possible Symptoms.                                                                  
Message "ACFAE046 Security Initialization Error" displays at region startup.