The url http://cfconventions.org/Data/standardized-region-list/standardized-region-list.xml is dead, so `CFChecker.checker` fails on line 511 when called on a `CFChecker` object initialized with file path.
The url http://cfconventions.org/Data/standardized-region-list/standardized-region-list.xml is dead, so
CFChecker.checkerfails on line 511 when called on aCFCheckerobject initialized with file path.