I had this happen a few times in 8.7 but it was just because of a spotty wifi connection. I switched to a computer-to-computer network and it worked fine...
Thanks barkbark00. How do you get a computer-to-computer network?
I think the wifi is ok so I went through the process again. This time I saw that the build is successful but it 'Fails' to upload into the iPhone. But the Viewer does appear on the iPhone.
I would delete the build from your phone. And try to build again in xcode. Also check what version your using in xcode. 3.2 doesn't work for me, but 3.1 and earlier does.
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I think the wifi is ok so I went through the process again. This time I saw that the build is successful but it 'Fails' to upload into the iPhone. But the Viewer does appear on the iPhone.
http://www.dummies.com/how-to/content/how-to-create-a-wireless-ad-hoc-network-between-macs.html
Good to know but did not work for my situation.
I had this happen before but cannot remember how I fixed it.