My Libaries aret working (do i have the right ones)

Hi, i was trying to code my DIY Otto to run using otto_run.ino but when i try compiling it says "No such files or directory found"
My code i uses in in the attachments

Otto_run:17:10: error: Oscillator.h: No such file or directory

Multiple libraries were found for "Servo.h"
#include <Oscillator.h>

Used: C:\Program
^~~~~~~~~~~~~~

compilation terminated.

exit status 1
Oscillator.h: No such file or directory

Otto_run.ino (2.96 KB)

Oscillator.h: No such file or directory

Have you installed the Oscillator library ?