Solution : Remove the bot folders from the ,nuget package and install them again via the robot tray. This did a fresh deployment of the latest package and the permission issue was resolved in the subsequent run.
Hi Thank you for your reply!
Fortunately, I found resolution by myself.
No need to re-Build package. Instead, I had to choose departed workflow folder again at invoke workflow file activity as well as I had to remove unused xaml files in my project.