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TM4C129, error #10234-D: unresolved symbols remain problem

Hi All,

My platform is TM4C129

CCS version 5.5.0.00077

TivaWare-2.0.1.11577

I have included the graphic library

#include "grlib/grlib.h"

Then I add a function for test 

But when the compiler in the linking stage,there are errors.

Description Resource Path Location Type
#10234-D unresolved symbols remain NNGT129 C/C++ Problem
#10010 errors encountered during linking; "NNGT129.out" not built NNGT129 C/C++ Problem
unresolved symbol GrContextInit, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol GrContextFontSet, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol GrCircleFill, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol g_sFontCmss30b, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol GrStringDraw, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol GrRectFill, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem
unresolved symbol GrRectDraw, first referenced in ./MonitorCommand.obj NNGT129 C/C++ Problem

I have no idea about this issue, if there are any advise, please let me know, thanks.