ERROR : L6449E while processing

I am using stm32f4 Discovery tool keil.

I have library file in .a format for Ex : algorithm_cal.a like this
I am adding this file to file group and made option to target on right click on that file & make it has Library file.
when building it getting a error as

ERROR : L6449E while processing <obj.o> <msg>
.\STM32F411_FW_USB\STM32F411_FW_USB.axf: Error: L6449E: While processing ..\..\file path(obj.o): Symbol table section #12 refers to string table section #10 but that section has type 1 (SHT_PROGBITS) instead of SHT_STRTAB

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