I can\'t install any of my iOS developer distribution or developer linked provisioning profiles onto my iPhone 5S running iOS beta 4 with Xcode beta 4 on OS X Yosemite dev previ
I had this same problem last night and this morning. I am using xcode 6 beta 4, ipad mini ios 8 beta 4, iphone 5 ios 8 beta 4.
Go to developer.apple.com go to your certificates, revoke your current development certificate. create a new one and download it. shut down xcode. and drag and drop your newly downloaded certificate into xcode on your dock. let xcode open.
to make sure your certificates are properly loaded, go to xcode/preferencecs/accounts/view details to see if the certificates & provisioning profiles are there.
if all looks good so far, then clean your project, build it and then run it on your iOS device.