I haven't listed anything for a few months and now I am getting this error also. I thought maybe my credit card needed updating so I did that. I checked with eBay online chat. They said my account is OK, and said I should try a direct listing without using 3rd party software, but I shudder at the thought. So I have no idea why I am getting the error 240 either. Has eBay recently (within the past 6 months) changed their policy to prohibit all hyperlinks? That's the only other thing I can think of. I tried relisting an item I successfully listed in the past and got the same error.