Permission denied for Maven wrapper in CircleCI build

I was following a tutorial to setup CI pipeline for my GitHub repository with CircleCI. This is my config.yml file:

version: 2 # use CircleCI 2.0
jobs: 
  build: 
  
    docker: 
      - image: circleci/openjdk:8-jdk
      
    steps: 
      - checkout
      - run: chmod +x mvnw ./mvnw clean install

Unfortunately, I am getting this error:

Error fetching your jobs

#!/bin/bash -eo pipefail ./mvnw clean install /bin/bash: ./mvnw: Permission denied

Exited with code exit status 126 CircleCI received exit code 126

Previously was using this command: - run: ./mvnw clean install but for both cases, I am getting same error.

I am a beginner in this field.

I used offline build dependency and now it works