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compiling problem

hi guys,

i'm having a problem when compiling my program the error is as follow :

compiling SPI_STM32F4xx.c...
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\1.0.8\RTE_Driver\SPI_STM32F4xx.c(36): error: #5: cannot open source input file "cmsis_os.h": No such file or directory #include "cmsis_os.h"
C:\Keil_v5\ARM\PACK\Keil\STM32F4xx_DFP\1.0.8\RTE_Driver\SPI_STM32F4xx.c: 0 warnings, 1 error
".\Objects\untitled.axf" - 1 Error(s), 144 Warning(s).
Target not created.

i really need help as soon as possible!!

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