I don't clearly understand your example You and your friend share a certain Word file Does this mean you and your friend wrote the sentences in it? That's what it seems to mean. Could this or similar case sometimes happen?
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CliveYou and your friend share a certain Word file. Does this mean you and your friend wrote the sentences in it?
All kinds of errors are possible..No, the error in the sentence is made by another person, not you or your friend. Sorry.
SupercatYou both know that there's an error in a sentence in the file.You write like,I write:
AlpheccaStars I write:There is an error in this sentence.You / I made the error, so [you] / [I'll] fix it.Ahh..sorry for confusing. That is not the first time that you and your friend talk about the error. You both have already talked and know about it.