Problems exporting to Windows Phone 8

Hey people.

I'm having some problem exporting to Windows Phone 8:

I've made everything in the tutorial ( ), but I just can't export the game to the format that I need to upload it for Windows Phone 8 Store. I keep getting the following when click in Build Solution:

Full Image: Can someone help me with it?

Thanks in advance!

Did you read the tutorial on how to export to winphone8? You make absolutely all the steps from tutorial?

Yes. I don't know if I need to install anything else besides the Visual Studio, but I've done everything the tutorial said. :\</p>

Yes. I don't know if I need to install anything else besides the Visual Studio, but I've done everything the tutorial said. :\</p>