"Nie chcę tego otworzyć."

Translation: I do not want to open this.

[moconnoma]

Duolingo has been strict about the distinction between imperfective and perfective aspect. With negative sentences the imperfective is supposed to be used: "Nie chcę tego otwierać".

[Jellei]

True. The sentence has therefore been deleted - we cannot change anything in the 'original' sentence, only the translations.