The error committed by the learner in the sentence "Sasi permission for a hour." is an example of syntactic error.
The mistake here is in the sentence structure or word order. The correct form would be: "Sasi [needs/asked for] permission for an hour."
The error is syntactic because it involves improper word arrangement or missing components in the sentence. "A hour" is also incorrect because "hour" starts with a vowel sound, so it should be preceded by "an" instead of "a."