Ok so I've seen this problem commonly occur with Unity 5 and Vuforia 4 as it doesn't support the 64 bit version. Thing is, I don't have that and I'm getting the same error.
My current set up is:
Window 7 64 bit
Now what I'm trying to do is take a model and get it to walk around a space on a desk. I have the model rigged, moving, Mechanim working whole 9 yards, works fine minus the AR bit.
The problem starts when I go and work with the AR camera which doesn't recognize the intergrated webcam's profile. I looked that up and added it into the profile.xml like so:
<!-- size of the web cam texture requested from Unity -->
<!-- size of the texture Unity's web cam texture will be rescaled to -->
The bolded part is the only part I edited, Error didn't fix. Opened up console for Unity and again no errors, one warning (concerning my character controler) but nothing that should be causing my issue. The Webcam name was copy pasted from my device manager so I'm 99% sure that's how my laptop reads the camera.
When I hit play it just goes to a strange top inverted view from the camera AR added (I took out the default camera as per the instructions). From what I understand hitting play is suppose to turn on my webcam and look for the trackable in it's view and go from there.
Here's a screenshot of my settings as well
Thanks for any help in advance.