I'm trying to install Istio based on the default documentation provided on their website (https://istio.io/docs/setup/getting-started/#download), but I'm running into a permission denied error with a .pem file when I attempt to do so:

(base) (username)@ubuntu:~/istio-1.6.0$ istioctl install
This will install the default Istio profile into the cluster. Proceed? (y/N) y
Error: failed to apply manifests: invalid configuration: unable to read certificate-authority /home/(username)/.bluemix/plugins/container-service/clusters/mycluster-br39j0bd02hrl9bffbtg/ca-hou02-mycluster.pem for mycluster/br39j0bd02hrl9bffbtg due to open /home/(username)/.bluemix/plugins/container-service/clusters/mycluster-br39j0bd02hrl9bffbtg/ca-hou02-mycluster.pem: permission denied

Any thoughts on how I could resolve this error?