If your listing can't be ended, usually it is because there are items/artwork that haven't been approved yet. There are two ways to fix this issue.
1. Cancel order items via 'End' button
Using the article How to end a property campaign you can navigate how to end your campaign. A pop up will appear, under 'Action for Orders' cancel each item from the drop down. You should then be able to click 'End Campaign' without issue.

2. Order tab, cancel items individually
Alternatively, you can open the orders tab and delete the item/s by clicking the remove button. Once these are removed, you should be able to end your listing without any issues.

Related Articles
How to end a property campaign
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