StartUp shows an error after upgrade

Problem:

After upgrading to version 8.6, StartUp script shows the following error:

TWS for UNIX/STARTUP 8.5.1
Licensed Materials - Property of IBM*
5698-WSH
(C) Copyright IBM Corp. 1998, 2016 All rights reserved.
* Trademark of International Business Machines
Program code level: 20120510
Killed
ld.so.1: /export/home/svtUser/TWS/trace/atctl: fatal: 
libatrc.so: open failed: No such file or directory
Killed
AWSBHU507I A start command was issued for NC121016.

Cause and solution:

During the upgrade to version 8.6, the following configuration files:

tws_env.sh
tws_env.csh
jobmanrc
TWSCCLog.properties
StartUp
MakePlan
SwitchPlan
SwitchPlan
CreatePostReports
UpdateStats
ResetPlan
Sfinal

are not overwritten but the 8.6 version of above files are installed under tws_home/config directory, and therefore to remove the above error message you must merge manually the two version of the files modifying the file under tws_home directory.