i can't backup my VCSA using Bash script

Hi Guys,

i need your help, i am trying to backup my vcenter appliance using bash script but i am facing an issue could related to API, as shown below

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root@VCSA [ /tmp/CERT ]# sh ./vcpu.sh

{"type":"com.vmware.vapi.std.errors.unauthenticated","value":{"messages":[{"args":[],"default_message":"Authentication required.","id":"com.vmware.vapi.endpoint.method.authentication.required"}]}}Backup job id:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

100   188    0   188    0     0   3737      0 --:--:-- --:--:-- --:--:--  3836

Backup job state:

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your help is highly appreciated 

Thanks