Robot studio isn't telling me where my syntax errors are

I'm working on some code in Rapid, but RobotStudio doesn't tell where or why my code doesn't work.
I think the line below might be the problem.
checkpoint := IsReachable(point, printhead, wobj0);
I'm not sure how to fix it

Below is the rest of the code

MODULE MainModule

    ! (name), started 11 27 2018

    ! This code read a file of eight positions per set and checks if the robot can reach each set

    ! This done for a workspace analysis

    VAR iodev reader;

    VAR iodev writer;

    VAR pos corner;

    VAR string word;

    VAR bool check;

    VAR bool checkpoint;

    VAR robtarget point;

    PERS tooldata printhead := [ TRUE, [[ 85.22, 0, 79.57], [0.707170, 0, 0.707170, 0]], [0.79496, [16.02,9.4,44.26],  [1, 0, 0, 0], 0, 0, 0]];

    

    ! This function is from msalminen on the ABB forums

    ! https://forums.robotstudio.com/discussion/8278/string-to-number-conversion-and-checking-the-reachability-in-rapid

    FUNC bool IsReachable(robtarget pReach, PERS tooldata ToolReach, PERS wobjdata WobjReach)

      ! Check if specified robtarget can be reach with given tool and wobj.

      ! 

      ! Output:

      !  Return TRUE if given robtarget is reachable with given tool and wobj

      !  otherwise return FALSE

      !

      ! Parameters:

      !  pReach     - robtarget to be checked, if robot can reach this robtarget

      !  ToolReach  - tooldata to be used for possible movement

      !  WobjReach  - wobjdata to be used for possible movement

         VAR bool bReachable;

         VAR jointtarget jntReach;

  

         bReachable := TRUE;

  

         jntReach := CalcJointT(pReach, ToolReach\Wobj:=WobjReach);

  

         RETURN bReachable;

  

         ERROR

             IF ERRNO = ERR_ROBLIMIT THEN

                bReachable := FALSE;

                TRYNEXT;

            ENDIF

     ENDFUNC

    

    

PROC main()  

        Open "U:/RAMSeniorDesign/RobotStudio Stations/Workspace/ReadTest1.txt", reader \Read;

        Rewind reader;

        Open "U:/RAMSeniorDesign/RobotStudio Stations/Workspace/ReadTest1b.txt", writer \Append;

        word := ReadStr(reader);

        check := StrToVal(word,corner);

        point := [ [ corner.x, corner.y, corner.z], [0.707170, 0, 0.707170, 0], [0,0,0,0], [ 9E9, 9E9, 9E9, 9E9, 9E9, 9E9]];

        checkpoint := IsReachable(point, printhead, wobj0);

       

        Write writer, ""\Pos:=corner;

        Write writer, ""\Bool:=checkpoint;

        Close reader;

        Close writer;        

ENDPROC

ENDMODULE