Android: Could not find or load main class org.gradle.wrapper.GradleWrapperMain
<p>I am trying to build my project on GitLab CI but unfortunately for me I keep getting this error inside the runner:</p>

<p><code>Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain</code></p>

<p>Now I know there is something wrong with my environment but I just cant get my mind wrapped around the problem. I searched on the web and I found I needed to update my <code>.gitignore</code> file and I did here it is:</p>

<pre><code>### Java ###
*.class

### Android ###
*.apk
*.ap_

### Package files ###
*.war
*.ear
*.aar

### Gradle ###
.gradle
 build
bin/
build/
build.xml
gen/
.gradle/
gradlew
gradlew.bat
gradle-wrapper.jar
gradle-wrapper.properties

### Android Studio ###
.idea
local.properties
.DS_Store
/captures
</code></pre>

<p>I also eddied my <code>gradle.build</code> to contain the following lines: </p>

<pre><code>task wrapper(type: Wrapper) {
gradleVersion = '2.0' 
}
</code></pre>

<p>But again every time I run a build I get stack! Here is also my <code>.gitlab-ci.yml</code>:</p>

<pre><code>before_script:
- apt-get --quiet update --yes
- apt-get --quiet install --yes wget tar unzip openjdk-7-jdk lib32stdc++6   lib32z1
 - wget --quiet --output-document=gradle.zip https://services.gradle.org/distributions/gradle-2.8-bin.zip
 - unzip -q gradle.zip
 - export ANDROID_HOME="/opt/android-sdk"
 - chmod +x gradlew

 dev:
 script:
 - ./gradlew assembleDebug
</code></pre>

<p>And the line where the error appears is:</p>

<pre><code>- wget --quiet --output-document=gradle.zip https://services.gradle.org/distributions/gradle-2.8-bin.zip
</code></pre>