There has been an error while processing the form
Introduction
There has been an error while processing the form.
See the error when we try to upload the Info Path form on the SharePoint 2010 website.
Issue
We got this error message when submitting Info Path form via a web browser "There has been an error while processing the form”
Cause
A DLL required for the operation hasn’t registered in the registry the DLL was “htmlchkr.dll” (Microsoft Markup Analysis Processor)
Solution
Execute the below command to solve the issue.
regsvr32 "C:\Program Files\Common Files\Microsoft Shared\OFFICE14\htmlchkr.dll"
See at: http://expertsharepoint.blogspot.de/2014/07/there-has-been-error-while-processing.html
Note: If you find a different solution, please report it as a comment on this post. This will be useful to the SharePoint Community. Be sure to double-verify it: undo your solution and verify that the problem comes back, then redo it and verify that the problem goes away.