Error while jumping fields in add new record on site

Has anybody seen this error message while testing a site page that calls an add new record interface.?

"The provided urlStub for the site was not valid."

I have been looking in the documentation for any clues with no success.

If I test the interface in desgin mode I have no errors, the add new record is called with no issues but when entering information in any fields and later jumping to another this error message pops up.

I have checked all related pages, intefaces and process model but cant find the issue.

can somebody point me to the right direction?

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