Found an intermediate folder compile warning

Hi,

This annoying compile warning always pops up when I start compiling. Any thoughts on what is causing this?

1>EXEC : warning : UnrealBuildTool found an Intermediate folder while looking for rules ‘Z:\UnrealEngine\Engine\Source\MyProject\Intermediate’. It should only ever be searching under ‘Source’ folders – an Intermediate folder is unexpected and will greatly decrease iteration times!

Thanks,