What does this error mean?
This is a direct message from eBay that means the listing's description has too much content.
"Content" also includes the HTML code for design templates and description formatting.
What is the character limit for eBay descriptions?
An eBay description's max-character limit is 500,000.
This may sound like a lot, but HTML styles and formatting often require a lot of space.
How to fix:
One of these troubleshooting steps may help in most cases:
Remove featured items from your design template.
Hide or delete extra blocks in your design.
Remove unnecessary text in your design template or description.
Check the item description for extensive formatting (tables, widgets, and other special elements may require a lot of HTML code)
The goal is to lessen how much content is in the description area.
While a lot of text could be the cause, templates and formatting code use much more space than text alone.