When referencing the Phone7.Fx assembly in a new clean Windows Phone project, the camera capablility is added to the application.

You can check this by uploading the XAP file to the marketplace. Click next and then previous.
You'll return to the upload page with a list of detected capabilities.
Detected capabilities: data services, Silverlight framework, camera

The camera capability is a problem here. I don't want to have that in my app if I'm not using camera functionality.
The weird thing is, using the visual studio marketplace test kit, the camera capability is not detected.

Move the code that is using the camera API to a second assembly.

Also see my blog post about this issue:
Check your Windows Phone application capabilities

Just add:

to "force" the marketplace capability routine to correctly detect it ;)

Please read the original message. I don't want the camera capability, because I'm not using it.