Undefined variable error when passing to include_task file in loop

[Mohtashim S]

I am dealing with nested loops inorder to build dynamic host using add_host.

Outer Loop:      with_items: "{{ command_result.stdout_lines }}"  // gets me the list of users
Inner Loop:      with_items: "{{ dest_ip.split(',') }}"          // gets me the list of IP addresses seperated by comma (,)

The below code works fine. 

   - name: Add hosts

     include_tasks: "{{ playbook_dir }}/gethosts.yml"

     vars:

       dest_ip: "{{ item.split('\t')[0] }}"
       file_dets: "{{ item.split('\t')[1] }}"
       USER: "anystring"
#       USER:  "{% if item.split('\t')[3] == 'FrontEnd' %}user1{% elif item.split('\t')[3] == 'BackEnd' %}user2{% else %}{% endif %}"
       ansible_host: localhost
       install_dir_pass: "anystring"
#       install_dir: "{{ item.split('\t')[2] }}"

     with_items: "{{ command_result.stdout_lines }}"

Below is my include_task gethost.yml file:

---

 - name: Generate JSON data

    add_host:

      name: "{{ item }}"

      groups: dest_nodes

      ansible_user: "{{ USER_pass }}"

      install_dir: "{{ install_dir_pass }}"

    with_items: "{{ dest_ip.split(',') }}"

I get the below error if I uncomment either USER_pass or install_dir_pass and comment the existing value:

TASK [Generate JSON data] ***********************************************************************************************************************************
task path: /app/deployment/gethosts.yml:2
 [WARNING]: The loop variable 'item' is already in use. You should set the `loop_var` value in the `loop_control` option for the task to something else to
avoid variable collisions and unexpected behavior.
fatal: [localhost]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: list object has no element 2\n\nThe error appears to be in '/app/gethosts.yml': line 2, column 4, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n---\n - name: Generate JSON data\n   ^ here\n"
}
NO MORE HOSTS LEFT ******************************************************************************************************************************************
PLAY RECAP **************************************************************************************************************************************************
localhost                  : ok=12   changed=1    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0   

Requesting a solution to this issue and an explanation of a few questions I have. 

       1. The dest_ip is read and works fine with .split(,) method inside of include_task get_hosts.yml file when other variables like install_dir_pass dont seem to work. 

   

       2. When USER_pass and install_dir_pass are given simple string "anystring" it works and is read fine inside of get_hosts.yml where as if they are assigned values using   item.split('\t')[<num>] the playbook errors as above. 

I have already tested using debug that all the entries in command_result are good and the values should be populated correctly as below.

   - debug:
          msg: "{{  item.split('\t')[0]  }}"
     with_items: "{{ command_result.stdout_lines }}"
   - debug:
          msg: "{{  item.split('\t')[1]  }}"
     with_items: "{{ command_result.stdout_lines }}"
   - debug:
          msg: "{{  item.split('\t')[2]  }}"
     with_items: "{{ command_result.stdout_lines }}"
   - debug:
          msg: "{{  item.split('\t')[3]  }}"
     with_items: "{{ command_result.stdout_lines }}"