UIDesignerSchema Error Message

[Robert Choi]

I am doing “Getting started Ultimate Inventory System”.

Now I am getting a message of “The selected UIDesignerSchema is not valid, the error is you may not use the UI Designer at runtime”.

UIDesignerSchedma is successfully created by “Duplicate” option.

What is the solution?

 

[Sangemdoko]

“The selected UIDesignerSchema is not valid, the error is you may not use the UI Designer at runtime”
This should only happen if you are currently in play mode.
You can't change the UI while in playmode, it is an editor only tool. UIDesigner is a tool used to get started quickly on your UI. Once the UI is created UIDesigner has no effect on it.

If the warning is happening while you are not in playmode that would be very weird. Just in case try closing and reopening the editor window or Unity