calabash-ios physical device test, app starts but crashes

Running calabash-ios cucumber for simple iPhone app. Simulator is working perfectly. When trying on physical device, app loads, crashes, then loads again, and crashes again, on a loop.

Error message: Unable to start. Make sure you've set APP_BUNDLE_PATH to a build supported by this simulator version Calabash::Cucumber::Launcher::StartError: Time out waiting for UIAutomation run-loop Error while writing to fifo. RunLoop::Fifo::NoReaderConfiguredError. Logfile /var/folders/9s/yttj4cz93m98hqs6bfw2x8xr0000gn/T/run_loop20150522-12657-dr3m49/run_loop.out

2015-05-22 19:58:11 +0000 Fail: An error occurred while trying to run the script. Instruments Trace Complete (Duration : 2.594758s; Output : /var/folders/9s/yttj4cz93m98hqs6bfw2x8xr0000gn/T/run_loop20150522-12657-dr3m49/trace.trace) to run the script. UIAScriptAgentSignaledException

(Calabash::Cucumber::Launcher::StartError) /Library/Ruby/Gems/2.0.0/gems/calabash-cucumber-0.14.3/lib/calabash-cucumber/launcher.rb:766:in new_run_loop' /Library/Ruby/Gems/2.0.0/gems/calabash-cucumber-0.14.3/lib/calabash-cucumber/launcher.rb:631:inrelaunch'

Steps: - loaded app-cal on device - ran in command-line using: $ DEVICE_TARGET=udid BUNDLE_ID=com.company.app DEVICE_ENDPOINT=http://ip:37265