Unable to complete the "Superbadge: Data Stream Fundamentals - Add to the Data Model Object" due to the error "Whoops, looks like there was a problem. Please try again."

Hi Everyone, 

I am unable to complete the "Add to the Data Model Object" challenge from the Superbadge: Data Stream Fundamentals. 

The Error comes out as: "Whoops, looks like there was a problem. Please try again." 

 -I tried to redo the entire challenge but same error message comes out.  

- created a field called "International Contact" in the Account Contact DMO as per instructions and requirement.  

- Double checked the DMO if there's a same field name or something, but unable to find any duplicate field. 

- I labeled my org playground as "Superbadge - Data Stream Fundamentals - Developer Edition" in case someone becomes confused with the error message.

Not sure what else I could have missed.  

Thank you in Advance Trailblazers!