Hi,
I have the following problem with Nintex Forms 2010 (V 1.3.0.0) (I know it is an really old version and I already suggested to upgrade, but maybe somebody can help anyway.)
We built some really simple forms for some lists we have and the clue and main point is to hide fields for some users. So we decided to use the runtime function "IsMemberOfGroup()" and when somebody is not inside the group, hide some fields. This has to be done for each field using the expression field for visibility. Everything worked fine in our test environment which is hosted at the customer side in an identical environment like the production is.
But now when we try to export and import the forms, we get the error above. After some investigation it seems that even when I build a new form in the production environment, which has the same version and site collection like in test environment, I get the error as soon as I add the "IsMemberOfGroup()" function and save the control settings dialog. Even when I add a sharepoint default group or no group...?!
Now if anybody had the same problem and knows where to dig, please let me know. I already opened a support ticket but time is running and I need to know what is going on.
Thank you guys!