The question above does not have the sentence it refers to, which makes it impossible for me to identify any kind of error. However, I will help you identify it.
The first step to find the error in the sentence is to read the sentence or the whole paragraph where it is presented. After this reading, you should:
If all these guidelines do not allow you to identify an error, you should type the sentence into an online dictionary and see if any corrections are suggested.
If none of this points to an error in the sentence, you can consider it to be correct.
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