CVI

dear experts,

i have adopted with cvi2013 written software and although i'm expirience with other development systems but not with Labview CVI, i could not solve the linker problem shown below:

  options.c

#include "radioGroup.h"  //"custctrl\radioGroup.h"

static int optionspnl;

int  CVICALLBACK ecuAntennenAuswahl_CB(int panel, int control, int event, void *callbackData, int eventData1, int eventData2){
STRUKT;
BEDIENER;

    int index;
    
    switch (event){
    case    EVENT_COMMIT:
        //                    panel-hndl(!), ctrlRadiogroup,      resultPtr
        Radio_GetMarkedOption (optionspnl, OPTPNL_RADIOGROUP, &index);
        // GetCtrlVal (panel, control, &index);
        PRINT_I(index);
    break;
    }
    return 0;
}
 
  Link app.exe
  error: Undefined symbol '_Radio_GetMarkedOption@12' referenced in "c: options.obj".  

perhaps someone knows the solution and can help me. I am a beginner with the LabView/CVI.

Thanks