This is a fresh install, 2.1.5 beta, no 3rd party addons of any kind installed.
When I go to create a custom member field it errors out with this:
Fatal error: Call to private method Members::_valid_fieldname() from context ‘EE_Form_validation’ in /home/(user)/public_html/(system)/expressionengine/libraries/EE_Form_validation.php on line 643
Just in case this has already been addressed as a bug and fixed, is there a manual fix you can lead me to?