Attempting to compile a CubeMX generated project reports errors

[Scott3]

When I attempt

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:211: Error: selected processor does not support `dsb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:222: Error: selected processor does not support `isb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:266: Error: selected processor does not support `dsb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:281: Error: selected processor does not support `dsb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:749: Error: selected processor does not support `dsb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:760: Error: selected processor does not support `isb 0xF' in Thumb mode

C:\Users\Scott\AppData\Local\Temp\ccZvyICB.s:797: Error: selected processor does not support `dmb 0xF' in Thumb mode

Drivers/STM32G0xx_HAL_Driver/Src/subdir.mk:69: recipe for target 'Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_cortex.o' failed

make: *** [Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_cortex.o] Error 1

Why?

Thanks,

Scott