Error:

ebayid:82 Failure | ErrorCode:21917121 

ShortMessage:Condition is not applicable. 

LongMessage:Condition is not applicable for this category. The condition value submitted has been dropped.



Explanation and Solution: 

The Condition, that you are using for that particular item is not allowed for the category that you are listing to and this is triggering the above error. You can go to this eBay page http://pages.ebay.com/help/sell/item-condition.html and you would be able to see the available and accepted item conditions by category and then you need to enter in the correct condition, which can be used for the particular category, that you are trying to list to.