ı want try this project but ı have problem please help me 
https://forum.arduino.cc/index.php?topic=54196.0
error code ;
C:\Users\ER\Desktop\Stilo_3_0\Stilo_3_0\Stilo_3_0.ino: In function 'void printOnOffbutton(boolean, int, int)':
C:\Users\ER\Desktop\Stilo_3_0\Stilo_3_0\Stilo_3_0.ino:515:35: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
myGLCD.print("ON", x1+55, y1+7);
^
You need to understand the difference between warnings and errors. A warning is the compiler telling you there is something in the code that could possibly cause a problem but doesn't cause the compilation to fail. An error is a problem with the code that causes compilation to fail. In this case you have posted a warning, not an error.
It's best to write code that doesn't produce warnings but there are some warnings that don't represent a serious problem with your code. This is one of those. Fix it if you like. Ignore it if you like. Either way, don't let it block your progress.