When she tried to upload an item she intended to sell on eBay with Tubo Lister version 184.108.40.206, my wife received the error message below:
Warning - The postage cost will be calculated based on dimensional weight, not the actual weight of your package. Please check the weight and dimensions of your package.
She had specified the dimensions and weight of the item and both domestic and international shipping options, so it wasn't apparent to either of us why she received the message. Apparently, the warning can be ignored, though. I found someone else, exdwh posting the following at Re: error code: 21916962 on July 9, 2010.
That's only an informational warning.
The only way to 'get rid of this error' would be to substitute the dimensional weight as calculated by the shipping carrier.
A better solution is to filter out the warnings you don't care about.
When she ignored the message and uploaded the item for sale with Turbo Lister, the item looked fine on eBay.