macOS Post Install script

Hello,

I need help with the postinstall script , I ma using package maker and have put a workflow in postinstall section .

Everything is done fine on my system But as same package run on another system its giving script error and installation fails

I have tried each and everything but not getting why this is happening. There is no problem with scripts in work flow its has apple scripts.

Even i tried using open file in postinstall.

I just want to execute My .app as soon as install gets over.

Please help me how can i dot that?

Thanks,
Ruhi