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Undefined symbol

I know this is a question that has been asked many times, but I've tried a lot of different solutions already, and none worked for me. For additional details, I have included the entire TivaWare library in ARM Compiler -> Include Options -> Add dir to #include search path. I've also added "driverlib.lib" in ARM Linker -> File Search Path -> Include library file or command file as input. Basically, I've followed every step listed in this instruction page: http://www.instructables.com/id/Creating-a-new-Tiva-Project-in-Code-Composer-Studi/?ALLSTEPS.

Everything has been working so far and I have been able to use every library in the driverlib folder, but when I included the "uartstdio.h" from the utils folder and use its functions, it's giving me this error: 

undefined first referenced
symbol in file
--------- ----------------
UARTStdioConfig ./main.obj
UARTprintf ./main.obj

error #10234-D: unresolved symbols remain

I went ahead to make sure that "uartstdio.c" exists, and it does in the same utils folder as "uartstdio.h".

If you guys could help me out, that'd be great.