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500 error when trying to add a domain name to a Site
Just went to Sites --> "Add your first custom domain" and got the 500 error.
Same if I go Sites --> (select site) --> "Domains" tab --> "Add domain" --> 500 error.
This is literally the final thing I wanted to test before upgrading to Pro.
TL;DR
500 error occurs when attempting to add a domain to a site. Developer encountered this when trying to add a custom domain through 'Sites' menu. This seems to be the last step before upgrading to Pro.500 error when trying to add a domain name to a Site
