Could not get unknown property 'mavenUser' for Credentials
<p>All I am getting following error in <strong>build.gradle</strong> in Android Studio :</p>

<pre><code>Could not get unknown property 'mavenUser' for Credentials
        [username: null] of type
org.gradle.api.internal.artifacts.repositories.DefaultPasswordCredentials_Decorated
</code></pre>

<p>Below my <strong>Gradle</strong> file:</p>

<pre><code>buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.7.+'

        repositories {
            mavenCentral()
            maven {


                // ~/.gradle/gradle.properties should be configured!
                credentials {
                    username mavenUser
                    password mavenPassword
                }
                url 'http://dev.softwerk.se:8080/nexus/content/repositories/softwerk-repo'
            }
        }

        android {
            compileSdkVersion 19
            buildToolsVersion "19.0.1"

            defaultConfig {
                minSdkVersion 8
                targetSdkVersion 19
                versionCode 2014020601
                versionName "2.0.0"
            }

            compileOptions {
                sourceCompatibility JavaVersion.VERSION_1_7
                targetCompatibility JavaVersion.VERSION_1_7
            }
        }

        dependencies {
            compile 'com.android.support:support-v4:19.0.+'
            compile 'com.android.support:appcompat-v7:19.0.+'
            compile 'com.google.android.gms:play-services:4.0.30'

            // Sync framework
            compile 'se.softwerk.commons.android:android-framework:1.1.10@aar'
            compile 'com.googlecode.plist:dd-plist:1.0'
            compile 'com.google.code.gson:gson:1.7.1'
            compile 'commons-io:commons-io:2.1'
        }
    }
}`
</code></pre>