The Collaborative International Dictionary of English v.0.48:

Misinterpretation \Mis`in*ter"pre*ta"tion\, n.
   The act of interpreting erroneously; a mistaken
   interpretation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misinterpretation
    n 1: putting the wrong interpretation on; "his misinterpretation
         of the question caused his error"; "there was no mistaking
         her meaning" [syn: misinterpretation, misunderstanding,
         mistaking]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "misinterpretation":
   aberrancy, aberration, corruption, defectiveness, delusion,
   deviancy, distortion, errancy, erroneousness, error,
   error in judgment, fallaciousness, fallacy, false coloring,
   falseness, falsity, fault, faultiness, flaw, flawedness, hamartia,
   heresy, heterodoxy, illusion, injudiciousness, misapplication,
   misappreciation, miscalculation, miscomputation, misconjecture,
   misconstruction, misdirection, misdoing, misestimation,
   misevaluation, misfeasance, misjudgment, misreading,
   misrepresentation, misuse, misvaluation, peccancy, perversion,
   poor judgment, self-contradiction, sin, sinfulness,
   skewed judgment, slanting, straining, torturing, unorthodoxy,
   untrueness, untruth, untruthfulness, wrong, wrong construction,
   wrong impression, wrongness