This error occurs when you've reached your listing limit on eBay. If this is due to hitting your limit of total sales per month, we have three solutions available when this happens.
You can take advantage of our Max Listed Quantity feature. This is available on both an account wide and per SKU basis. This way, you can limit the amount of inventory listed per listing and stay under your sales limit. Learn how set the Max Listed Quantity here.
You can follow the link in the error to request an increase in your limits on eBay: https://scgi.ebay.com/ws/eBayISAPI.dll?UpgradeLimits&appId=0&refId=19
You can do a combination of options 1 and 2!