### Issue description Hi, I'm using gardenctl to login into the kubernetes cluster. When then I add the config to seabird I get:  ### Steps to reproduce try to add a cluster config from file ### System information 0.5.1
Issue description
Hi, I'm using gardenctl to login into the kubernetes cluster. When then I add the config to seabird I get:
Steps to reproduce
try to add a cluster config from file
System information
0.5.1