K8S 二进安装 kubectl api-versions出问题

Question

k8s 二进制安装，前面一系列工作都顺利完成，在用kubectl 命令时总是出现如下错误，无法解决：
[root@node01 ~]# kubectl api-versions
error: error loading config file "/etc/sysctl.d/k8s.conf": couldn't get version/kind; json parse error: json: cannot unmarshal string into Go value of type struct { APIVersion string "json:"apiVersion,omitempty""; Kind string "json:"kind,omitempty"" }

[root@node01 ~]# cat  /etc/sysctl.d/k8s.conf 
net.bridge.bridge-nf-call-ip6tables=1
net.bridge.bridge-nf-call-iptables=1
net.ipv4.ip_forward=1
net.ipv6.conf.all.disable_ipv6=1

---

错误位置：
error: error loading config file "/etc/sysctl.d/k8s.conf": couldn't get version/kind; json parse error: json: cannot unmarshal string into Go value of type struct { APIVersion string "json:"apiVersion,omitempty""; Kind string "json:"kind,omitempty"" }

请问哪位同志有遇到同样的情况，能给予指教吗？