Error:Cannot invoke method systemProperty() on null object

[anivaler]

Hi, I have this error:
"Error:Cannot invoke method systemProperty() on null object"

Android Studio 1.3.2

I've tried integrate Linkedin SDK and sdk contains robolectric dependencies.

build.gradle in Linkedin library:

allprojects {
repositories {
mavenCentral()
}
}

buildscript {
repositories {
mavenCentral()
}

dependencies {
classpath 'org.robolectric:robolectric-gradle-plugin:1.0.0'
}
}

apply plugin: 'android-library'
apply plugin: 'org.robolectric'

android {
sourceSets {
androidTest {
setRoot('src/test')
}
}
compileSdkVersion 17
buildToolsVersion "19.1.0"

defaultConfig {
    minSdkVersion 8
    targetSdkVersion 16 
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

}

configurations {
}

robolectric {
include '*_/_Test.class'
}

dependencies {
compile 'com.android.support:support-annotations:20.0.0'
compile 'com.android.support:support-v4:21.0.+'
compile fileTree(dir: 'libs', include: ['*.jar'])
compile files('libs/volley.jar')
androidTestCompile('junit:junit:4.12')
androidTestCompile('org.robolectric:robolectric:2.4')
}

Thanks in advance.

[erd]

This plugin is no longer being maintained.

[anivaler]

But how can I resolve this issue?