Seaching for an error in a sample sentence

[Anette1]

Hello,

Could you please help me with the following sencence:

Whats wrong with it, I can't find an error:

"The teacher is collecting the student's books in order to correct them".

Thanks in Advance - Anette

[Torsten]

It probably should read The teacher is collecting the students' books in order to correct them". (The apostrophe should be after the plural 's' of the plural 'students'.) By the way, in your question an apostrophe is missing.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Anette1]

@Thorsten: Thank you very much for your quick help