Anyone able to use their own customer self-signed certs?

rke cert generate-csr
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./cluster_certs/kube-service-account-token-key.pem -out ./cluster_certs/kube-service-account-token.pem
rke up --custom-certs

DEBU[0001] [certificates] reading file kube-admin-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-admin-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-apiserver-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-apiserver-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-apiserver-proxy-client-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-apiserver-proxy-client-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-controller-manager-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-controller-manager-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-etcd-10-2-78-209-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-etcd-10-2-78-209-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-node-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-node-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-proxy-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-proxy-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-scheduler-csr.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-scheduler-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-service-account-token-key.pem from directory [./cluster_certs] 
DEBU[0001] [certificates] reading file kube-service-account-token.pem from directory [./cluster_certs] 
DEBU[0001] Certificate file [./cluster_certs/kube-service-account-token.pem] content is greater than 0 
FATA[0001] Failed to validates certificates from dir [./cluster_certs]: Failed to find master CA certificate