Value does not fall within the expected range

Question

Error when trying to display the form designer.

See picture of the error:

Answer 1

A hail mary: restarting Visual Studio worked for me.

Answer 2

This problem can be caused by changes to the project properties / settings file. If recent changes have been made to the settings do the following:-

1. Check that the settings xml file does not contain any unwanted elements.
2. Close Visual Studio and restart VS and open the project

This should fix your issue.