Can't install app because of "internal api error"

I'm trying to install my app on a device for testing but it always fails because "An Internal API error occured." To make this stranger is that it is happening on 2 of 5 devices! I can't find a solution anywhere. PLEASE HELP!!

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FINALLY GOT IT TO WORK!!!!!!!!!!!


Ok, deep breaths. I deleted all of the profiles in Xcode and redownloaded them. FINALLY!!

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Too many ways this can happen to be able to accurately guess, I think.


Which version Xcode?


What iOS on the two devices that are acting out?


What was the last (major) change you made to that project?