reference - ROS Arduino Bridge not compiling -

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i downloaded package rosarduinobridge , examples come packages don't work in arduino.

the error keep getting is:

rosarduinobridge.cpp.o: in function 'runcommand()': /usr/share/arduino/rosarduinobridge.ino:150: undefined reference 'readencoder(int)' /usr/share/arduino/rosarduinobridge.ino:179: undefined reference 'readencoder(int)' /usr/share/arduino/rosarduinobridge.ino:234: undefined reference 'initmotorcontroller()' collect2: error: ld returned 1 exit status

i'm confused on why error showing since haven't changed code @ all.


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