Error: "Sequence contains no matching element"

Not applicable
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Products: Nintex Workflow 2010, Nintex Workflow 2013, InfoPath 2010, InfoPath 2013


When working with InfoPath and Nintex Workflow, you are using "Assign Flexi Task", or "Request Approval" action and selecting "Task content type" to "... task using InfoPath". 

This applies to Nintex 2010 and Nintex 2013 Workflows.

Then when you try to publish you get this error, however you are still able to save the workflow.

The error:


Message from webpage


Server was unable to process request. ---> Sequence contains no matching element





Only able to save the workflow but, not publish the workflow.


This applies for both 2010 and 2013 versions.

1. Open the "Assign Flexi Task", or the "Request Approval" action  > Change the Content Type from Nintex Workflow Task to Nintex Workflow task using InfoPath (wording is slightly different based on version and action type but same process)

2. Click Edit Task Form > Edit with Microsoft InfoPath 2010 (or 2013 depending on version)

3. Save your InfoPath form, then publish it back to the site

4. Go back to the "Assign Flexi Task", or the "Request Approval" action, which should have remained open > Click Save

5. Save your workflow

6. Publish your workflow