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CCS/SW-EK-TM4C1294XL: ISR Handler remains unresolved

Part Number: SW-EK-TM4C1294XL

Tool/software: Code Composer Studio

Hello there,

I have a EK-TM4C-1294XL board an running the GrLib demo.

I´m trying to defin a timer  ISR, but the routine remains unresolved saying 

"unresolved symbol PpmMatchIntHandler, first referenced in ./startup_ccs.obj grlib_demo C/C++ Problem"

 
I have defined it in 

1) grlib_demo.cpp, like void PpmMatchIntHandler(void){ .... };
2.) in startup_ccs.c as an extern function "extern void PpmMatchIntHandler(void); "
3.) in startup_ccs.c within the "g_pfnVectors" table


Even if I define a function prototype in grlib_demo.cpp, it doesn´t help.


Does someone have an idea, what I´m missing?

best regards!