[Flex3] CSS type selectors are not supported in components XXX

This warning probably means CSS type selectors are defined or the css file is referenced in a custom component.

Solution one:

Move the type selectors definition into the main application.

Solution two:

Replace the type selectors with class selectors.

		Label {
			font-weight: 'bold';
		}

replaced with

		.label {
			font-weight: 'bold';
		}