编译时(寄存器版本)，出现下面这个错误，咋回事啊？小白求解

2019-07-20 22:54发布

*** Using Compiler 'V5.06 (build 20)', folder: 'D:KEIL5ARMARMCCBin'
Build target 'Target 1'
compiling test.c...
linking...
..OBJ est.axf: Error: L6405E: No .ANY selector matches usart.o(i.uart_init).
..OBJ est.axf: Error: L6405E: No .ANY selector matches sys.o(i.Stm32_Clock_Init).
..OBJ est.axf: Error: L6405E: No .ANY selector matches usart.o(i.USART1_IRQHandler).
..OBJ est.axf: Error: L6405E: No .ANY selector matches sys.o(i.MY_NVIC_Init).
..OBJ est.axf: Error: L6405E: No .ANY selector matches sys.o(i.MYRCC_DeInit).
..OBJ est.axf: Error: L6405E: No .ANY selector matches delay.o(i.delay_init).
..OBJ est.axf: Error: L6405E: No .ANY selector matches delay.o(i.delay_ms).
..OBJ est.axf: Error: L6405E: No .ANY selector matches test.o(i.main).
..OBJ est.axf: Error: L6405E: No .ANY selector matches sys.o(i.MY_NVIC_PriorityGroupConfig).
..OBJ est.axf: Error: L6405E: No .ANY selector matches usart.o(i.fputc).
..OBJ est.axf: Error: L6405E: No .ANY selector matches sys.o(i.MY_NVIC_SetVectorTable).
..OBJ est.axf: Error: L6405E: No .ANY selector matches usart.o(i._sys_exit).
Not enough information to list image symbols.
Not enough information to list the image map.
Finished: 2 information, 0 warning and 12 error messages.
"..OBJ est.axf" - 12 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:02

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