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Compiler/TMS570LS1227: Unresolved symbol error in CCS when trying to port FreeRTOS to chip

Part Number: TMS570LS1227

Tool/software: TI C/C++ Compiler

Hello, 

I'm trying to port FreeRTOS to a TMS570LS1227PGE following these instructions: Unfortunately I am getting a "unresolved symbol xTimerPendFunctionCall, first referenced in ./source/os_mpu_wrappers.obj" error when trying to build my code. I'm assuming this is an issue with the path to my header file? I have correctly added my project header files to the path and copy/pasted the os_ header files, the FreeRTOS header files, and the os_ .c files to my PGE directory. Any ideas where I may have missed a path?

Thanks