Which of the following sentences have an incorrect usage of preposition as per the rules of English grammar?
1. The manager was sitting at the desk.
2. My work is superior to yours.
3. I prefer coffee than tea.
4. She was accused for stealing gold.
5. This is an exception to the rule. 6. They are leaving to England soon.
Identify the part of the sentence that contains an error:
"Neither the manager nor the employees ___ willing to accept the new policy."