Encountered an error(Invalid rule UUID in expression) for using Groups in Appian Portal

A Score Level 1

Hi there,

I'm exploring Appian portals. I'm trying to implement self registration process using Appian portals. I have created interface, Integration object and Web API (kickoff the process model to create user). I have tested interface object separately to create user on clicking of submit button (On click of a submit button, call Integration to invoke Web API). It works absolutely fine. 

However, when I used this interface in portal and published it. Its throwing me below error.

The UUID mentioned in the error is a constant which is holding list of groups. I checked the security for constants and all groups, its all set fine. Not sure why this error is coming.

Can you please help me with this?

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