Help with error: The file 'MainWindow.xaml' is not part of the project or its 'Build Action' property is not set to 'Resource'.

Question

Oddly enough, googling this error doesn't produce any results.

Is there any quick fix for this bug / known causes?

The file's build action is Page like the rest of my xaml windows, and it is definitely part of the project.

Answer 1

The problem was a button click eventhandler that wasn't pointing to the correct method.