User variable NOT updating when package is executed in SSIS Catalog 2016

Hi there!

I am working on upgrading a SSIS 2008 package to SSIS 2016. The package checks if the source file exists or not using a script task and the value is updated in a user variable. The check works fine in SSIS 2008 andin SSDT (VS 2015 Shell). However, it is not updating the variable as expected when I deployed it into SQL 2016 -SSIS catalog.

The user variables I used are:

SourceFileExists - Read and write variable, Boolean type, package scope. values expected True or False

SourceFullPath - Read only variable. Source path includes file name as well.

Visual Basic 2015 script in the script task

Public Sub Main()

    Dts.Variables("User::SourceFileExists").Value = File.Exists(Dts.Variables("User::SourceFullPath").Value)

Basically, the default value is not getting overwritten with run time value. User running the package in SSIS and SSIS catalog is same.

Any ideas are appreciated.

Thank you!