Some times, I got failed to post a message in our forum
You will get the error message like:
Database Error
Please try again. If you come back to this error screen, report the error to an administrator.
But you don't know which chars cause this. Here is a way to find it.
For example, you can copy a text from this page
GB 2312 - Wikipedia, which got such error. You can put your text in Notepad++, and see below image: 2022-11-05-convert-ANSI.png
And in the menu->Encoding, try to click the ANSI menu item, you got the result like below image: 2022-11-05-result.png
Now, you see which chars cause this error.