For this type of errors, we basically need to take care of some points and those are
1.Close the virtual box if opened
2. Delete the previous temp file that is generated
3. Set this to the proxy if you are behind it
And then run the following commands which help to delete and start the minikube again,
minikube stop
minikube delete
minikube start
This will solve your issue it some times occurs due to proxy issues and previous temp files that can be resolved by this.