Hey, I have found the cause for the Plot page returning a 500 error, you had set one of your plots which had a parent to the campaign but it was not under the specified parent and the system encountered an error because of it - I am in the process of fixing that and as a workaround have removed your Plot article's parent so you can now load the page and see your items.

I successfully identified the issue because of a newer bug report and I will keep updating that one with updates due to more context there - please upvote it to get notifications of any updates there!