Indication of this warning L6304W: Duplicate input file stm32f1xx_hal_msp.o ignored

I am working with STM32f1xx and HAL drivers. When I build the program in keil microvision4 software it shows: NIBP.axf: Warning: L6304W: Duplicate input file stm32f1xx_hal_msp.o ignored as warning. Would you please answer me what this warning pointed to.

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