CircleCI Could not locate Gemfile in subfolder ruby gem

I have a ruby gem project, let’s say this is the folder structure

- org-lib
  - .circleci
  - ticketing
    - ticket-management

so my gem is in folder ticket-management, and there is Gemfile and Gemfile.lock there. and all the spec.

and this is my circleci yml

version: 2.1
jobs:
 ticket-management-job:
    working_directory: ~/ticketing/ticket-management
    docker:
      - image: circleci/ruby:3.0.1
    steps:
      - checkout
      - run:
          name: "Install Bundle"
          command: "bundle install"
      - run:
          name: "Run Test"
          command: "bundle exec rspec spec/ticket_management_spec.rb"
workflows:
  ticket-management-workflow:
    jobs:
      - ticket-management-job

when i push it i got error

bundle install
Could not locate Gemfile

Exited with code exit status 10
CircleCI received exit code 10

How to fix this error? How to properly setup CI at ruby gem?