FortiGate 201E show “7163: Unknown action” on a scheduled config backup script

I am trying to follow the following guideline to setup a scheduled auto backup script on Fortigate firewall,

https://kb.fortinet.com/kb/documentLink.do?externalID=FD39818

Example of backup script,

config system auto-script
  edit "backup_config_to_XXXXXk01"
 set interval 60
 set repeat 0
 set start auto
 set script "execute backup config tftp xxxxxxfw01.conf 10.x.x.69"
 next
end

Firewall model: FortiGate 201E

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Working: manually execute the command, it works and TFTP server received that file without problem as shown below,

enter image description here

Not working: when I schedule it to execute, the log shows “7163: Unknown action 0”.

enter image description here

What is the problem here?

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Author: Thomas G. Lau