[Andreas]

Due to the way it is currently implemented, your XML must define at least 2 Hooktypes:

<?xml version="1.0" encoding="ISO-8859-1"?>

<hooks>

	<hooktype type="custom">
		<hook>custom1</hook>
		<hook>custom2</hook>
		<hook>custom3</hook>
	</hooktype>

	<hooktype type="custom2">
		<hook>custom2_1</hook>
		<hook>custom2_2</hook>
		<hook>custom2_3</hook>
	</hooktype>
	
</hooks>

The Filename should match your Product ID.
Also, there should be hooktype_xyz Phrases in Phrasegroup Plugin System for all your Hooktypes.