Plugin: Role Scoper

I can install role scoper but when I go to activate it, i receive the following error messages:
Warning: Creating default object from empty value in B:\myblogsite\wp-content\plugins\role-scoper\definitions_cr.php on line 57
Warning: Creating default object from empty value in B:\ myblogsite \wp-content\plugins\role-scoper\taxonomies_rs.php on line 37
Warning: Creating default object from empty value in B:\ myblogsite \wp-content\plugins\role-scoper\taxonomies_rs.php on line 37
Warning: Creating default object from empty value in B:\ myblogsite \wp-content\plugins\role-scoper\taxonomies_rs.php on line 37

The site is new and just being set up on localhost.