The correct version of the given sentence is as follows:
A grammatical error may be defined as an illustration of inaccurate, irregular, or contentious usage, such as a misplaced modifier or an inappropriate verb tense. It decreases the efficiency of language.
The given sentence is incorrect because when accomplishing traditional script, we must compose who is the subject in the first part before delivering a pronoun such as her in this case in the second part.
Therefore, it is well described above.
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