the.com/error
The universe's polite way of telling you the plan and reality disagreed.
means A mistake, fault, or deviation from what is correct, intended, or true.
from From Latin errare, to wander or stray — so an error is literally thought that went off the trail and got lost.
Margin of errorStatistics admitting it cannot promise certainty.
Knight's tourA 1962 Mariner probe lost over one missing hyphen.
Errant knightsSame root: wandering heroes, not blundering ones.