Got the following InfoPath Forms Services error after submitting a form:

"An error occurred accessing a data source"

 Also, open the InfoPath form in design mode, modify one of the Data Connections, e.g. Submit Workflow Service, and got warning:

"The Internet address "http://<your server name>/K2 BlackPearl Data Connections/InfoPath Web Service/Submit Workflow.udcx?noredirect=true' is not valid."

Furthermore, check root site collection level, e.g. http://<your server name>, there is no K2 BlackPearl Data Connections library.

However, there is K2 BlackPearl Data Connections library under the subsite location where the form was published to, for instance, http://<your server name>/<your site>/<your form library>/K2 BlackPearl Data Connections/

Resolution:
- Delete the K2 BlackPearl Data Connections library under subsite
- Via K2 Designer --> InfoPath Integration Wizard, open the InfoPath form in design mode, Tools --> Data Connections, delete all data connections
- In InfoPath Integration Wizard --> InfoPath Form Deployment Location, make sure SharePoint Site URL = http://<your server name>/<your site> and Form Library = <your form library>
- Click Next ... Finish
- Deploy the project

A new K2 BlackPearl Data Connections library should be creatd under the subsite, which contains UDCX files such as "can I Submit.udcx", "Get Actions.udcx", "Execute Smart Object Method.udcx", and "Submit Workflow.udcx".

Try to submit the form.

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HTH,
Frank

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