Template Report Error: Object reference not set to an instance of an object

Hello,

 

I've recently created a workflow that queries several different data sources, gathers some attributes, and saves them to a dataset that I pass to a template report. When I go to run the workflow it maks it all the way to the template report activity where it gives me the "Object reference... blah blah blah". Knowing that this means that something that I'm passing to the activity is null/nothing, I've double-checked everything that I'm passing to the activity and ensure that the datatables etc. have the correct names that the template report has the correct URI. I've also exported the final dataset to an excel file and downloaded this as a tempfile when the workflow executes. I successfully recieve the download and I can inspect the excel file and see that data is indeed present.

 

Has anyone run into something like this and able to point me to the fault in my workflow?

 

Thanks!