We are unable to fetch this data, sorry!

We are unable to fetch this data, sorry!

I get the error:
"We are unable to fetch this data, sorry! Please note that your data is SAFE.
Report this problem to support @ zohocreator . com"

I have shared my application.
Problem is that I can't order the view (verjaardagen) on the picklist column (Koppeling met).
Also, when I try to edit a record, the picklist is empty again.

I use the picklist in other records too. The picklist for them is empty too when I try to edit a record.