LabVIEW as Arduino input and output

I am trying to make program for Robotic arm.In this project I'm use labview for controlling my digital I/O pin.I saw some example of interfacing Arduino and labview and make one program but i'm getting erron like this

'Arduino: 1.6.8 (Windows 8.1), Board: "Arduino Nano, ATmega328"

sketch\Roboarm.ino.cpp.o: In function `setup':

C:\Users\Desktop\GTU PROJECT\Roboprogram\ROboprogram with labview\Roboarm/Roboarm.ino:18: undefined reference to `syncLV()

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino Nano.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

pls any body help me