Error while retrieving package runtime configuration values in XS Admin Tool

Hello,

I try to set up CORS but when I open the XS admin console and select any package the following error occurs.

I tried to grant myself a package privileg (even if created the package myself) but this won´t work as "grantor and grantee are identical". I´m not able to log on with the SYSTEM user. Any help would be appreaciated.