Intorjucer: no rule to process file

After deleting and renaming some of my source files using the introjucer, I get the following warning in XCode . . .

warning: no rule to process file '$(PROJECT_DIR)/../../Source/GUI_RootComponent.h' of type sourcecode.c.h for architecture i386

I can easily remove the warning by going to [ Targets / Build Phases / Compile Sources ] and then removing the offending header file (as advised here, but every time that I save my project in the Introjucer, the offending header is replaced in the list.

You’ve probably managed to tick the “compile” box for that file in the introjucer, which would tell it to always try to compile that file, regardless of its file extension.

That was it. I renamed a cpp to be a header and it kept the compile flag. Thanks