As per Twitter, make sure you have a custom tag path pointing to [instance]/customtags - which should be there by default. You could use a mapping, pointing to one of the subdirectories within that [instance]/customtags directory, eg: /coldfusion pointing to [instance]\CustomTags\com\adobe\coldfusion, then use:
ulist = new coldfusion.query();
// etc
I'd just use the custom tag directory approach though.