Clicking the button or link 'Follow the Project' is giving an error

When I login to my organization’s circleci website, I could not see the “create a project” button for the repo for which I am one of the admin, but the button “Follow the project”, against the name of the repo, which I clicked. I got this message “Something went wrong when trying to follow your project”.
Upon verifying, I found the following message trace…

#!/bin/bash -eo pipefail
mvn clean test

/bin/bash: mvn: command not found

Exited with code exit status 127

CircleCI received exit code 127

I don’t understand why Circleci is not able to find the maven build tool. Should we include any steps in the config.yml file for that ?
This is my first config.yml writing for me.

To give you the config.yml I am using, it is here…

version: 2.1
# from Browserstack site



      # specify the version you desire here

      - image: cimg/base:2021.04


      # Customize the JVM maximum heap limit

      MAVEN_OPTS: -Xmx3200m  


      - checkout

      # Download and cache dependencies

      - restore_cache:


          - v1-dependencies-{{ checksum "pom.xml" }}

          # fallback to using the latest cache if no exact match is found

          - v1-dependencies-

      - run:

          name: Run Tests

          command: |

            export DISPLAY=:99

      - save_cache:


            - ~/.m2

          key: v1-dependencies-{{ checksum "pom.xml" }}

      # run tests!

      - run: mvn clean test

      - store_artifacts:

          path: target/surefire-reports

          destination: tr1

      - store_test_results:

          path: target/surefire-reports