Xcode error when running on device: "Could not allocate a resource"

I'm getting the error "Could not allocate a resource" when I try to run on any of my devices. I've seen this as a possible fix:

sudo rm -rf /var/db/lockdown/

I've tried that and restarted my machine a handful of times, but no luck. I also tried changing USB ports. I've reinstalled Xcode as well after uninstalling with AppCleaner.

In addition to the error, whenever I connect a device it asks me "Trust This Computer?"

This is occurring on an iPhone 5 and iPhone 6+ with lightning, as well as an iPad 3 with the old style connector.