Problem with path when running code (Blynk looks for "/usr/local/lib")

What version of Blynk Library did you try to install? C++ (WiringPi) or NodeJS?

C++ - Using C++ on a Raspberry Pi with Blynk

NodeJS - http://help.blynk.cc/how-to-connect-different-hardware-with-blynk/raspberry-pi/how-to-install-nodejs-library-on-linux

EDIT - OK, I am not a fan of the WiringPi so I had to double check if it used onoff or not… but based on what I see, and one of your comments above (that I previously missed) it looks like NodeJS.

What type of RPi are you using?

You can try to reinstall and see it that helps…

sudo npm install onoff -g