I’m using eBay.co.uk.
The error is generated by the eBay server. Can export your listing and send it to us for further investigation?
Hi, how do I sent it to you? I’ve exported the gslisting file but it won’t let me upload it (saying it must be a valid file type).
Have you tried to compress it using the context menu in the Finder? If that doesn’t help, you can always mail it to garagesale@iwascoding.com
Hi,
I’ve sent the file to your e-mail. I would appreciate if you can look at it, thank you.
Received your exported listing, tried and received the same error you are getting. I opened a ticket with eBay developer support, but from the error message it sounds that some genius at eBay decided that not accepting listings that only offer ‘collect in person’ is the desired behaviour. 
Hi,
Yes it looks that way. But if I use the eBay site, it allows the collect in person as an option…there’s no need to even enter a shipping option. It’s a stand-alone option.
Are you waiting for a response from eBay?
Kind regards,
Phil.
Yes. Thanks for the information about the behaviour on the eBay website.
eBay get back to me. They changed their code to fix some kind of bug, which broke GarageSale when offering a single “Local Pickup” or “Collect in person” shipping service.
eBay suggested a workaround, which doesn’t solve the issue. I’m waiting for additional feedback now.
Hi,
Any news from eBay on this error?
It’s stopping me from using GarageSale at the moment.
Regards,
Philip.
Sorry, nothing new from eBay since last week. I’ll bug them again.
HI, I am also having this issue, just wondering is there is any update?
HELP please, im having this issue aswell, i can upload the listing via GS with collect in person but i have to pick a postage service otherwise i get the error message. i then go through eBay into the advert and select “revise the listing” and select collect in person and it gives me the option to remove the postage service garagesale is forcing me to select, and just leave collect in person on the listing. but if i try it via garagesale i get this message attached below.im using gs ver 7.0.20 
Hi,
Yes we really need a resolution to this. Having to manually change our listings on eBay is Time consuming and it defeats the purpose of using GarageSale.
It’s been long enough now…
An update please, this has been going on for a while and defeats the point in using garagesale for me, most of my items need to be collected in person.
Hi,
sorry for that. We are still trying to find a solution with eBay for the API GarageSale is using. We will fix this as soon as possible.
Regards,
Paul
Hi Paul,
Thanks for the update, any idea of a rough eta?
25 days is dragging on a bit and stuff is starting to build up.
Sorry, not ETA for resolution of this issue yet. Ebay dev support suggested two different workarounds to us, but none of them worked so far. Waiting for their next reply.
We might finally have found a solution for this problem. Please check this beta release of GarageSale 7 and report back. (A new beta version of GarageSale 8 with the same changes will follow shortly).
Any feedback if Local Pickup is working again?