Custom App Install Fails

Upon install we receive the following error;

Failed to install app: Error creating requirements

Requirements.json Code is as follows;

{
"user_fields": {
    "agent_setting": {
      "type": "dropdown",
      "key": "agent_setting",
      "title": "Agent Setting",
      "description": "To store setting for an agent",
      "raw_title": "Agent Setting",
      "raw_description": "To store setting for an agent",
      "position": 0,
      "active": true,
      "system": true,
      "custom_field_options": [{
        "name": "Any updates",
        "value": "any_updates"
      }, {
        "name": "Do not use tag",
        "value": "do_not_use_tag"
      }, {
        "name": "Updates with any comments",
        "value": "updates_with_any_comments"
      }, {
        "name": "Updates with public comments",
        "value": "updates_with_public_comments"
      }]
    },

"agent_tag": {
"type": "text",
      "key": "agent_tag",
      "title": "Agent Tag",
      "description": "To store an agent",
      "raw_title": "Agent Tag",
      "raw_description": "To store an agent",
      "position": 1,
      "active": true,
      "system": true
}
}
}