I’ve recently seen this error several times when attempting to preview a form I’ve published to InfoPath forms services.
I’ve logged two possible causes to this problem that are permission and feature related.
Option 1 – Make sure your application pool is running as a service account other than "local system" or "network service". You should update this via "services on server" as shown below but you could also manually update the identity.
Option 2 – Make sure that you have your enterprise site features enabled.
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InfoPath “Unknown Error” when attempting to load a browser enabled form, 10.0 out of 10 based on 1 rating
Ulysses Ludwig is a SharePoint architect with over 16 years in the IT and computer industry. Ulysses' primary focus is SharePoint but he dabbles in the latest web technologies and likes to develop software in his spare time.
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