Another grammatical error

No grammatical error, but those slashes are wrong. Also 'along' is not necessary.

One would not write or say "Is any error?" One would write or say: "Is there any error."

I would also note that a native-speaker would be most likely to write or say "Are there any errors?"

Is "our" right in sentence. Because I read that we use pronoun according to main subject.

Or

Two subjects are joint with "alongwith" use pronoun according to first subject

If the land belongs to both you and your wife, use 'our land'; if it belongs to you, use 'my land', if it belongs to your wife, use 'her land'. If it belongs to someone else, rewrite the sentence.