Please Help Chef server error

Chef Infra (archive)
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Hi All, I am getting below error in Chef. Please help.

ERROR: CONFIGURATION ERROR:chef-admin-server is an invalid chef_server_url. The URL must start with http://, https://, or chefzero://.

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Looks you need to supply a URL

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where do i supply a URL? Please advise. Thanks

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Wherever you supplied "chef-admin-server"

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where is the location for client.rb file? Please help.

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