มันขึ้นยังงี้อ่าคับ

C:\Users\user\Documents\Arduino\libraries\sketch_sep12a\sketch_sep12a.ino:4:22: fatal error: TimerOne.h: No such file or directory

#include <TimerOne.h>

                      ^

compilation terminated.

Multiple libraries were found for "LiquidCrystal.h"
Used: C:\Users\user\Documents\Arduino\libraries\LiquidCrystal
Not used: C:\Program Files\Arduino\libraries\LiquidCrystal
exit status 1
Error compiling for board Arduino/Genuino Uno.