Push Bullet & SR501 Motion Sensor Error

[TxRider]

I've installed an SR501 Motion Sensor onto my Pi 3 B+ and trying to use the PushBullet option so that I can receive when our control door has been opened but im running into an error.....ive been following the installation instruction from: https://youtu.be/2QL5k235258 , everything seemed to go just fine BUT when I try to run the file as: sudo python 9_pir.py, I changed the name from pir.py to 9_pir.py and placed my files into a folder called (Motion) .....this is the error that I keep getting, (pushbullet.sh not found)



I'm an IT person but new to the Raspberry Pi and Linux coding.

Thanks for any help !!

Ken