linking...
..\Output\YH-F407.axf: error: L6002U: Could not open file ..\output\system_stm32f4xx.o: No such file or directory
Finished: 0 information, 0 warning, 0 error and 1 fatal error messages.
"..\Output\YH-F407.axf" - 1 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:09:43