This is an odd place for a question about the Raspberry Pi :)
A guess would be that i2c-bus, which is a native addon, was installed with
one version of Node.js but is being run with another version of Node.js.
Reinstall i2c-bus and try again.
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For more options, visit http://beagleboard.org/d
Why do I get this error? I was just including i2c-bus in the project like
this. I am using nodejs v0.10.40 on Raspberry Pi 2 Raspbian:
var i2c = require('i2c-bus');
pi@raspberrypi ~/Projects/noderadio $ sudo nodejs noderadio2.js
/home/pi/Projects/noderadio/node_modules/i2c-bus/node_modules/bin