Abstract
The author discusses the learner's errors theories stemming from phycolinguistics, pragmalinguistics and language learning psychology. In the theory of discourse the scientists are concerned with the problems of understanding the metasense in communication, the way people extract information from extralinguistic sources, and how they overcome obstacles in intercultural communication. Reasons for communicative failures are considered from the pragmalinguistic standpoint. The author believes that elimination of communicative failures of pragmalinguistics nature calls for comments and explanatory notes different from those of traditional lexico-grammatical type. Innovation strategies in commenting with account of psycholinguistic factors are being developed within the lacuna theory; they could be included in the learner's errors theory.