title: Could not find property 'VERSION_CODE' Error:(21,0)
body: <p>I am trying to import a project in my Android Studio 1.5.1. I firstly removed one error of 'com.android.application' not found but then this error has been risen.
  <a href="http://i.stack.imgur.com/xi8pP.png" rel="nofollow">enter image description here</a></p>
  
  <blockquote>
    <p>Gradle sync failed: Could not find property 'VERSION_CODE' on
    ProductFlavor_Decorated{name=main, dimension=null,
    minSdkVersion=DefaultApiVersion{mApiLevel=14, mCodename='null'},
    targetSdkVersion=DefaultApiVersion{mApiLevel=23, mCodename='null'},
    renderscriptTargetApi=null, renderscriptSupportModeEnabled=null,
    renderscriptNdkModeEnabled=null, versionCode=null, versionName=null,
    applicationId=com.fractalwrench.androidbootstrap.sample,
    testApplicationId=null, testInstrumentationRunner=null,
    testInstrumentationRunnerArguments={}, testHandleProfiling=null,
    testFunctionalTest=null, signingConfig=null, resConfig=null,
    mBuildConfigFields={}, mResValues={}, mProguardFiles=[],
    mConsumerProguardFiles=[], mManifestPlaceholders={}}.</p>
  </blockquote>