You need to add your developers certificate back onto the device so you can use it for development again. If you being up the organizer window in encode you should be able to click on your device and see what certificates are associated with your device.
Sorry @SingleSparq but could you be a little more descriptive please? I've pretty much done everything from the video twice but I just can't get the GS viewer back on my phone.
Not familiar with the video but the message is referencing the iOS. So you updated your phone to iOS7 yes? You also updated your Xcode to the most recent version too right? Again in Xcode under windows menu (I think) there is something called organizer. Bring that up and that will show you your devices. If your device is connected it will show a green light, meaning it's set properly or Yellow meaning it's not. Click on that device and it will tell you what certificates it has on it. There you can also tell it you wish to use it for development.
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Can you explain in a little more detail? Thanks
I don't know what's going on