Error while installing RHCOS using ISO

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I am trying to setup openshift cluster on baremetal user defined infrastructure. I am getting error in below step,

https://docs.openshift.com/container-platform/4.6/installing/installing_bare_metal/installing-bare-metal.html#installation-user-infra-machines-iso_installing-bare-metal

Error message:
Error: parsing arguments
Caused by: getting sector size of /dev/sda
Caused by: opening /dev/sda
Caused by: Permission denied os error 13

error