Symptoms

I have a submit data connection that writes a form to a SharePoint library. However, in the InfoPath Integration, I get the following error:

The solution has not been opened. The following error occurred on opening: Value cannot be null. Parameter name: adapter

Due to this error, I'm unable to deploy my process. If I remove the submit data connection however, I'm able to deploy the process, but I need the submit data connection in order to write the InfoPath form to SharePoint.
 

Diagnoses

The Submit Workflow Service data connection was not correctly connecting.
 

Resolution

Customer removed the Submit Workflow Service data connection from the InfoPath form and rerun the InfoPath Integration wizard, this re-created the data connection.