fortigate backup cfg

[Sandy Hung]

Dear All:

I have some problem， I ran ansible fortigate backup cfg 

it's file have in path but ansible have error msg 

{ "msg": "Failed while reading configuration backup"}

I don't know what happened

This is my ansible

---

- hosts: localhost

  gather_facts: no

  vars_files:

   - fortikey.yml

  tasks:

    - name: backup system config

      fortios_config:

        host: "{{host}}"

        username: "{{username}}"

        password: "{{password}}"

        backup: yes

        backup_path: "/tmp/fortigate/"

        backup_filename: "backup_config.cfg"