title: Could not get unknown property 'fabricToolsVersion' for root project 'quickblox-android-sdk-master' of type org.gradle.api.Project
body: <p>i am getting this error </p>
  
  <blockquote>
    <p>Error:(7, 0) Could not get unknown property 'fabricToolsVersion' for root project 'quickblox-android-sdk-master' of type org.gradle.api.Project.
    Open File</p>
  </blockquote>
  
  <p>i recently migrated from android 2.3.3 to 3.0.1 the project was working fine. After migrating i got different errors after solving one i get a new error. </p>
  
  <p>can anyone tell me how can i fix this?  </p>
  
  <p>here i  my gradle.build</p>
  
  <pre><code> buildscript {
  repositories {
      maven { url 'https://maven.fabric.io/public' }
  }
  
      dependencies {
          classpath "io.fabric.tools:gradle:$rootProject.fabricToolsVersion"
      }
  }
  
  
  apply plugin: 'com.android.application'
  apply plugin: 'io.fabric'
  
  repositories {
      maven { url 'https://maven.fabric.io/public' }
  
      flatDir { dirs 'libs' }
  }
  
  android {
      compileSdkVersion rootProject.compileSdkVersion
      buildToolsVersion rootProject.buildToolsVersion
      flavorDimensions rootProject.dimensionDefault
  
      defaultConfig {
          applicationId "com.quickblox.sample.chat"
          minSdkVersion rootProject.minSdkVersion
          targetSdkVersion rootProject.targetSdkVersion
          versionCode rootProject.versionCode
          versionName rootProject.versionName
      }
  
      productFlavors {
          speedDev {
              dimension rootProject.dimensionDefault
              minSdkVersion 21
          }
          dev {
              dimension rootProject.dimensionDefault
              minSdkVersion rootProject.minSdkVersion
          }
      }
  
      buildTypes {
          debug {
              signingConfig signingConfigs.debug
              minifyEnabled false
              shrinkResources false
              proguardFile 'proguard-rules.pro'
              zipAlignEnabled false
          }
  
          release {
              signingConfig signingConfigs.debug
          }
      }
  
      signingConfigs {
          debug {
              storeFile file("../cert/debug.keystore")
              storePassword "android"
              keyAlias "androiddebugkey"
              keyPassword "android"
          }
      }
  
      lintOptions {
          abortOnError false
      }
  
  
  }
  
  
  dependencies {
      implementation (project(":sample-core"))
  
      implementation ("com.quickblox:quickblox-android-sdk-chat:$rootProject.qbSdkVersion")
      implementation("com.quickblox:quickblox-android-sdk-content:$rootProject.qbSdkVersion")
  
      implementation "com.github.orangegangsters:swipy:$rootProject.swipyVersion@aar"
      implementation "com.github.bumptech.glide:glide:${rootProject.glideVersion}"
      implementation (name: 'sticky-list-headers', ext: 'aar')
  }
  
  apply from: "../artifacts.gradle"
  apply plugin: 'com.google.gms.google-services'
  </code></pre>