why?

Hi, thanks for your report and for attaching the screenshot. As the error indicates, your post contains invalid HTML code. Please remove the following invalid tags before posting: a, p (data-slate-node), span (data-para-id), span (data-sent-id), span (data-slate-leaf), span (data-slate-node), span (data-slate-string), span (dir), and span (style).

Those tags are actually HTML elements that are usually inserted automatically when text is copied from a website, a rich text editor, a Word document, Google Docs, an AI tool, or certain translation tools.

In other words, the forum is detecting hidden formatting code embedded in the text you're trying to post. A common fix is to:

• Copy your text into Notepad (or another plain text editor).
• Copy it again from Notepad.
• Paste it back into the forum.
• Or simply retype the post directly in the forum editor.

That removes all the hidden HTML and formatting data that may be causing the error. Thanks!