3687613 - SAP ASE UPGRADE Error: sapdbctrl: Installation failed with rc=188 SAP ASE for BS

Customer is doing upgrade of SAP ASE and got error :

[PID 6017] readOut:  Invocation of this Java Application has caused an InvocationTargetException. This application will now exit. (LAX)
[PID 6017] readOut:  
[PID 6017] readOut:  Stack Trace:
[PID 6017] readOut:  java.lang.NullPointerException: while trying to invoke the method java.io.File.getPath() of a null object returned from Flexeraap2.ac()
[PID 6017] readOut:      at com.zerog.ia.installer.LifeCycleManager.dh(Unknown Source)
[PID 6017] readOut:      at com.zerog.ia.installer.LifeCycleManager.consoleInstallMain(Unknown Source)
[PID 6017] readOut:      at com.zerog.ia.installer.LifeCycleManager.executeApplication(Unknown Source)
[PID 6017] readOut:      at com.zerog.ia.installer.Main.main(Unknown Source)
[PID 6017] readOut:      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[PID 6017] readOut:      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[PID 6017] readOut:      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[PID 6017] readOut:      at java.lang.reflect.Method.invoke(Method.java:498)
[PID 6017] readOut:      at com.zerog.lax.LAX.launch(Unknown Source)
[PID 6017] readOut:      at com.zerog.lax.LAX.main(Unknown Source)
[PID 6017] readOut:  This Application has Unexpectedly Quit: Invocation of this Java Application has caused an InvocationTargetException. This application will now exit. (LAX)
[PID 6017] wait:  Process xxxx exited with rc=188
[PID 6017] readOut:  Pipe has closed
[PID 6017] readOut:  Process finished
[PID 6017] writeLinesToFile:  Writing file: /sybase/<SID>/sapdbctrl-config/sybInst.6203.out
[PID 6017] ERROR AT sybServer.cpp:luAppendResult:48214 TIME: 2025 Oct 08 19:08:09 DESCRIPTION: Installation failed with rc=188. Please check /sybase/<SID>/sapdbctrl-config/sybInst.xxxx.out LAST OS-ERROR: (2) : No such file or directory
[PID 6017] SAP_DB_LiveUpdate:  LiveUpdate failed
[PID 6017] *** ERROR => 'Database live update' failed: Installation failed with rc=188. Please check /sybase/<SID>/sapdbctrl-config/sybInst.xxxx.out. [sapdbctrl.cp 5720]

SAP Adaptive Server Enterprise 16 and higher for Business Suite

KBA , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Problem