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Request input to service was null - cannot be null

I got this error when running my flow from within Flow Designer. Can someone tell me what this error means? I know null means nothing. So one of my fields is coming up blank?


Context of error - creating a flow that searches for an account and then asks for information about an opportunity then creates a new opportunity for that account with the information provided. I receive the error right after I the form that asks for the opportunity information. So it's between the form and the data update.


Make sure you are not passing any "null" values when creating rows in the database when the field cannot be null.

The most common issue would probbly be when using choices - make sure there is a "Stored Value" set.

Check out this blog on working with choices.