The old GarageSale 8 is using an older eBay API.
These crashes are most likely due to eBay finally turning off their old attribute API.
Initially, that move was anticipated for January '22. We informed our users about the upcoming change and its incompatibility with GarageSale 7 and 8 back in October of 2021:
The solution is to upgrade to GarageSale 9, for which we re-built the internal attribute system to cope with this API change.
GarageSale 9 can be tested for free and you find more details about what’s new on our website here:
On first launch it will ask you to import your GarageSale 8 database so you shouldn’t lose any work:
https://manual.iwascoding.com/gs8/en/Installation_and_Setup-Importing_your_database_from_a_previous_GarageSale_version.html