ArmClang: error: unknown argument: '--reduce_paths'

Question

I can't build the program. 
 Please help. Thanks 
 This log: 
 Rebuild started: Project: blinky_pca10040e *** Using Compiler 'V6.21', folder: 'C:\Keil_v5\ARM\ARMCLANG\Bin' Rebuild target 'nrf52810_xxaa' ArmClang: error: unknown argument: '--reduce_paths' compiling main.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrfx_atomic.c... ArmClang: error: unknown argument: '--reduce_paths' compiling boards.c... ArmClang: error: unknown argument: '--reduce_paths' compiling app_error.c... ArmClang: error: unknown argument: '--reduce_paths' compiling app_error_handler_keil.c... ArmClang: error: unknown argument: '--reduce_paths' compiling app_error_weak.c... ArmClang: error: unknown argument: '--reduce_paths' compiling app_util_platform.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_atomic.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_assert.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_balloc.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_fprintf.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_fprintf_format.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_memobj.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_ringbuf.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_strerror.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_log_frontend.c... ArmClang: error: unknown argument: '--reduce_paths' compiling nrf_log_str_formatter.c... ArmClang: error: unknown argument: '--reduce_paths' compiling startup_nrf_common.c... ArmClang: error: unknown argument: '--reduce_paths' compiling system_nrf52.c... ".\_build
rf52810_xxaa.axf" - 19 Error(s), 0 Warning(s). Target not created. Build Time Elapsed: 00:00:01