I initialized Kubernetes with kubeadm init, and after I used kubeadm reset to reset it I found --pod-network-cidr was wrong. After correct
kubeadm init
kubeadm reset
--pod-network-cidr
I had a similar issue and the fix in that case was to apply the flannel pod network to the cluster:
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl apply -f kube-flannel.yml