Excel Exporter throwing Null Pointer error

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Hi, I followed the excel exporter document. At first empty Excel documents were downloaded without headings, but now I am getting Null Pointer Exception. Screenshots of the set up is as follows: Microflow that creates a PolicyDoc object: Microflow that download the Excel File: Domain model:   I didn’t understand the last part of the document where we have to associate the PolicyDoc object with Policy objects. How do I do it? Could you please guide me on it?   Thank you Sherlin
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Hi,

I had trouble setting association between the File entity and the main entity in which data to be exported in stored. 

Below is the screenshot of the microflow

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