Error 7

A means of excusing oneself for leaving a party. If you leave a party and the rest of the players begin messaging you with a tirade of abuse, to get out the flame war quickly, simply say "Sorry, Errno7" to immediately placate the aggressors.

The origins of Errno7 are sadly not yet shrouded in the mystery of history. The game of Guild Wars can, at any time and seemingly at random, kick you right out and simply say "Errno=7".

As everybody has experienced it at some point, using it as an excuse works a treat, as everybody hates this common enemy.

The End User License Agreement for any modern software product will always state that you will regard this kind of unreasonable error as acceptable.