Issue #3234 has been updated by Nobuyoshi Nakada. Category set to ext Status changed from Open to Assigned Assigned to set to Aaron Patterson Psych seems not using complex format, so this error doesn't occur. But it can't load the data dumped by Syck, too. I'm not sure where is the primary cause. ---------------------------------------- http://redmine.ruby-lang.org/issues/show/3234 ---------------------------------------- http://redmine.ruby-lang.org