Forum OpenACS Q&A: Re: Changing URL of Main Site: Error No Data Found
this happens because the name of the main subsite was changed, which should not be allowed by the user interface. We could reproduce the issue and we'll fix it.
For your instance, please execute this query in your postgres shell:
update site_nodes set name = '' where node_id = (select node_id from site_nodes order by node_id asc limit 1);
All the best