OK, the database is now denying the rights of the Apache user to grab error messages.
I need to warn you now that if you change this, you will be poking a hole in your security. It's necessary to get the data you need to fix the problem, but it's also dangerous. Don't leave it configured this way when you are not directly logged in and in charge. Hackers can steal access to your site. Be careful. Turn it off when you no longer need it. Make sure you know what you did when you turned it on, to make sure you can turn it off after you're done; take extensive notes. If you didn't and it's already done make sure the person you're working with provides you with instructions to make your site secure again.
However, take heart, it's only a small hole. All it allows, is for an attacker who has already obtained access, by another means, to edit signs of their presence from the logs. So unless you're already penetrated it's no biggie. Just make sure you don't leave it that way; some security expert like me might come along and scold you for it and whip you with a wet noodle.
Let me know if I can help.
Your site (quite rightly; it's a security precaution) will not allow me to upload the error file; I'll send it to your gmail account, if you like, but it's spam so I don't want to make a mess for you. LMK where you'd like me to post it (if you even need to know what's in it; very little, to my trained eye, but the timestamp.)
Oh, and of course it also means you got the error page fixed, which is a Very Good Thing because it's more efficient than letting the site search for something that doesn't exist. That's always longer than delivering an explicit error. A proper error is more efficient than an endless search that terminates whenever it's done finding out it has no idea what happened.
We need a directorate of science, and we need it to be voted on only by scientists. You don't get to vote on reality. Get over it. Elected officials that deny the findings of the Science Directorate are subject to immediate impeachment for incompetence.