(Steam, a physical disc, or a specific launcher) so I can give you more tailored steps?
The EXEC_ANNOT_FIND_ZONE (HOT) error appears in different scenarios. For cracked copies, it usually means a missing DLC .ff file. For Steam copies, it is almost always a verification or language issue.
In modern Call of Duty titles, a refers to high-tier loot areas or specific objective-based game modes. In older titles like Black Ops 1, it usually refers to a specific technical data zone needed for the engine to render a map or menu.