Can't install AMDeviceInstallApplication failed: -402620395


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Hi, I get this error when trying to test on an iPad mini retina with iOS 8.2.1
I've successfully installed the same app on the same device using test flight, so I know the certificates etc are all ok.

I've checked the version number is valid, i've tried to delete the app that I'd previously installed, no luck.
I've checked that my device is listed on apples Dev centre and is included in Xcode - it is.
I've tested on an iPhone and a full size iPad - no problem.

I've tried to test other games - same issue.

Any advice would be appreciated thanks.