This error simply means that the item you are trying to list will cause you to exceed the limit of quantity or total items value eBay allows you to list for that particular month.
You will need to reduce the quantity or price(s) of the item you want to list to be within the limit allowed by eBay for that month to be able to successfully list it.
Another option is also to request to be allowed to list more. To do so, simply go here.
You can visit your eBay seller dashboard to see your current selling limit.