App crashes when run on device

[jf990]

Build and run in simulator is working for me, but when I run the app on my device, iPhone 7 with iOS 13.3.1, app crashes almost immediately.

Thread 1
#0	0x000000010485f5e4 in __abort_with_payload ()
#1	0x0000000104866498 in abort_with_payload_wrapper_internal ()
#2	0x00000001048664c8 in abort_with_payload ()
#3	0x0000000104863848 in dyld::halt(char const*) ()
#4	0x000000010481aff4 in dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) ()
#5	0x0000000104815208 in dyldbootstrap::start(dyld3::MachOLoaded const*, int, char const**, dyld3::MachOLoaded const*, unsigned long*) ()
#6	0x0000000104815038 in _dyld_start ()

I thought maybe the build target was iOS 11 and my OS was 13.1 so I changed the build target to 13.1 but crashes in the same place. Updating to 13.1 also produces many more build warnings.

[jf990]

the prior version built on Runtime 100.6 ran fine on my device.

[jf990]

xcode 11.3.1