title: Problem with building android app, LeftShift error
body: <p>i have building problem in android studio, i have made an android app with beeware and when i am trying to build it i get an error.</p>
  
  <p>I have tried building it from android studio and i fixed all the versions problems and everything else except this error</p>
  
  <pre><code>Could not find method leftShift() for arguments [build_m0k5smvps1e1hvx1einev6dw$_run_closure1@34e45104] on task ':buildPythonDebug' of type org.gradle.api.DefaultTask.
  </code></pre>
  
  <p>I searched for answers but i didn't found something useful</p>
  
  <p>this is the build.gradle</p>
  
  <pre><code>    buildscript {
  repositories {
      jcenter()
      google()
  }
  
  dependencies {
      classpath 'com.android.tools.build:gradle:3.4.0'
  }
  }
  
  task buildPythonDebug &lt;&lt; {
  exec {
      commandLine "voc -v -p app -o build/intermediates/classes/debug   app".split()
  }
  exec {
      commandLine "voc -v -p app_packages -o build/intermediates/classes/debug app_packages".split()
  }
  }
  
  task buildPythonRelease &lt;&lt; {
  exec {
      commandLine "voc -v -p app -o build/intermediates/classes/release app".split()
  }
  exec {
      commandLine "voc -v -p app_packages -o build/intermediates/classes/release app_packages".split()
  }
  }
  task run &lt;&lt; {
  exec {
      commandLine "adb shell am start -n com.example.HelloWorld/android.AppName".split()
  }
  }
  
  apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 25
  buildToolsVersion "25.0.2"
  
  defaultConfig {
      minSdkVersion 15
      targetSdkVersion 25
      versionCode 1
      versionName "1.0"
  }
  sourceSets {
      main {
          manifest.srcFile 'AndroidManifest.xml'
          java.srcDirs = ['src']
          res.srcDirs = ['res']
      }
  }
  }
  
  project.afterEvaluate {
  packageDebug.dependsOn buildPythonDebug
  packageRelease.dependsOn buildPythonRelease
  run.dependsOn installDebug
  }
  
  dependencies {
  implementation 'com.android.support:appcompat-v7:25.3.1'
  implementation 'com.android.support:recyclerview-v7:25.3.1'
  }
  </code></pre>