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1.
When a person encounters a problem on a computer, calls for help, and finds out it's their fault. Also called a code 18.
Person 1: My CD drive won't open! :'(
Person 2: You're computer's off.
Person 1: Why does that matter?
Person 2: Wow, operator error!
by P.h.i.l June 11, 2005
 
2.
When a person encounters a problem on a computer, calls for help, and finds out it's the Dumbass Contractor's fault for sending a corrupt file.
IT - Hello

Employee #1 - Hi, Im trying to print a file, but the printer keeps giving me an error message.

IT - OK, we will take a look.

</ 2 min. pass>....

IT - Hello

Employee #1 - Sorry, its the file. I tried sending to another printer and got the same error. Just realized the contractor sent me a squirrely PDF thats 25MB for some reason. My bad, operator error.
by Employee #1 December 14, 2010