Lab 3.2 Cant access cluster after Reboot

I have setup my cluster in GCE like shown in the video of the course. Everything works fine. Then i setup the local repo in Lab 3.2 and i restarted like written in the manual. After restart i get following error when i want to access my cluster:

student@worker:~$ kubectl cluster-info
E0301 11:03:52.843058 5871 memcache.go:238] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0301 11:03:52.843469 5871 memcache.go:238] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0301 11:03:52.844927 5871 memcache.go:238] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0301 11:03:52.846334 5871 memcache.go:238] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0301 11:03:52.847657 5871 memcache.go:238] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
The connection to the server localhost:8080 was refused - did you specify the right host or port?

I setup the VM for the second time and i get the same error again afte reboot, what am i making wrong?

thanks.