We were getting the below error while trying to set the Items property of the Gallery control and were using Filters in the formula.
“The requested operation is invalid. Server Response: Sectors failed: No function signature for the function with name ‘contains’ matches the specified arguments. The function signatures considered are: contains(Edm.String Nullable=True, Edm.String Nullable=true).”
We were sure that the formula used was correct.
After trying for a couple of minutes more, we simply saved the app, and later when we again opened the app for edit, the error was no more there.
The same has been mentioned here –
Hope it helps..