Error in adding library file into project.

I am creating a library file and want to use it on keil project, .c file name is "a.c" and .h is "a.h" after bulding the project which contains only two files a.c and a.h with .lib extension it gives a.lib.

Now I want to add this a.lib in anothet project but it is producing an error please help reagrding this .

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