Gradlew not found

Build Environment
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I am still getting used to using circle CI, but when I wanted to test my first app I found the website with sample code. I tried to use it for my first build just to add it to my account. But I was surprised when it said ./gradlew was not found so it breaks in the download dependencies. I attached the .yml file. any help would be greatly appreciated

version: 2
jobs:
build:
working_directory: ~/code
docker:
- image: circleci/android:api-25-alpha
environment:
JVM_OPTS: -Xmx3200m
steps:
- checkout
- restore_cache:
key: jars-{{ checksum “build.gradle” }}-{{ checksum “app/build.gradle” }}

- run:

name: Chmod permissions #if permission for Gradlew Dependencies fail, use this.

command: sudo chmod +x ./gradlew

  - run:
      name: Download Dependencies
      command: ./gradlew androidDependencies
  - save_cache:
      paths:
        - ~/.gradle
      key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
  - run:
      name: Run Tests
      command: ./gradlew lint test
  - store_artifacts: # for display in Artifacts: https://circleci.com/docs/2.0/artifacts/ 
      path: app/build/reports
      destination: reports
  - store_test_results: # for display in Test Summary: https://circleci.com/docs/2.0/collect-test-data/
      path: app/build/test-results
  # See https://circleci.com/docs/2.0/deployment-integrations/ for deploy examples