Default Can someone help me?

I have a Lg G2 from verizon and im trying to root it with ioroot20 i watched the video on how to do it enable develper and usb debugging and connect your phone to a pc and for verizon choose ethernet and when i run the root bache file it works for a bit and at the endit says Mounting system, pushing su binary and installing SuperSu.
error: device not found
error: device not found
error: device not found
error: device not found
error: device not found
error: device not found
error: device not found
error: device not found
error: device not found
Rebooting final time.
error: device not found
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