I am setting up a Kubernetes cluster on Red Hat Enterprise Linux 8.9 (Ootpa) 4.18.0-513.18.1.el8_9.x86_64. I am using Kubernetes version 1.20.8 with docker (20.10.8) as container run time. I have to use this version of Kubernetes as the application I am going to deploy supports only this version. after OS is installed, i did setup cluster with calico and all worked fine. after restart the server calico controller is failing. below is the error message.