Spot the error out of the bracketed words. We try to speak (with) (one another) (but) (convey) _nothing.

Explanation

The correct answer is with because the phrase 'speak with one another' is not idiomatic in English. The proper expression is 'speak to one another,' which indicates direct communication between people. The other options are correctly used: 'one another' refers to mutual actions, 'convey' is correctly used in its base form, and 'but' effectively contrasts the two clauses.