Crash running in Xcode 15 on Device

Hi,

I have been testing an Apple Watch only app on simulator wth no issues.

Decided today to try on a device. It builds and deploys then crashes with about with payload.

libsystem_kernel.dylib`:
    0x472b81d8 <+0>:  mov    x16, #0x209
    0x472b81dc <+4>:  svc    #0x80
->  0x472b81e0 <+8>:  b.lo   0x472b81fc                ; <+36>
    0x472b81e4 <+12>: stp    x29, x30, [sp, #-0x10]!
    0x472b81e8 <+16>: mov    x29, sp
    0x472b81ec <+20>: bl     0x472ad490                ; cerror_nocancel
    0x472b81f0 <+24>: mov    sp, x29
    0x472b81f4 <+28>: ldp    x29, x30, [sp], #0x10
    0x472b81f8 <+32>: ret    
    0x472b81fc <+36>: ret    

Can anyone shed light on what this might be?

I have 5 packages one of which is a 'c' lib. Do not have issues running these on an iOS device however.