Automatically Generating Excel Report

Hi,

I am trying to build a business process that will automatically generate an excel report using the Generate Excel Report task, available through package IntExcelReport.

In the business process Convert File to Base64String I pass the file that is generated from Generate Excel Report task.

 Convert File to Base64String business process is as the following picture: 

In the script task I have the following code:

But the when I try to get the content of the File parameter (FileParam bp parameter) I get a null value.

What else should I try, or am I not configuring it right?

Thank you in advance