No categories in addon settings available

Ok so to start with appologies because this is probably a newby question (new to addon development, my first addon) but I can't figure out what I am doing wrong here:
I have added a settings.xml file in the userdata\addon_data subdir of my addon, the 'Configure' button of my addon becomes available, however the settings are not available and on the left side I only see "No categories available". What am I missing here?

Content of my settings.xml file:

<?xml version="1.0" ?>
<settings version="1">
<section id="service.test">
<category id="generic" label="Generic" help="Help!">
<setting id="file" type="video" label="File" help="Select the video file">
</setting>
</category>
</section>
</settings>

Quote from HarryH

I think the missing part is <group></group> as a wrapper for setting. Its mandatory also if you doesn‘t have more than 1 group.

XML

<?xml version="1.0" ?>
<settings version="1">
	<section id="service.test">
		<category id="generic" label="Generic" help="Help!">
			<group id="1" label="">
				<setting id="file" type="video" label="File" help="Select the video file">
				</setting>
			</group>
		</category>
	</section>
</settings>

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Thanks, good suggestion but no luck yet unfortunately.
It recognizes the section but then it stops