title: Gradle build error."minsdkversion 14 cannot be different than version l declared in library"?
body: <p>Hi everyone I am new to android developing.I download the latest version of android studio 1.3.2  yesterday.But when I start a new project for testing, gradle give me an error.
  My gradle is</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 21
  buildToolsVersion "23.0.1"
  
  defaultConfig {
      applicationId "com.example.niyamat.testing3"
      minSdkVersion 15
      targetSdkVersion 21
      versionCode 1
      versionName "1.0"
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
  }
  }
  
        dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  compile 'com.android.support:appcompat-v7:21.+'
  
  }
  </code></pre>
  
  <p>The error is </p>
  
  <pre><code>Error:Execution failed for task ':app:processDebugManifest'.
  &gt; Manifest merger failed : uses-sdk:minSdkVersion 15 cannot be different than version L declared in library [com.android.support:appcompat-v7:21.0.0-rc1]   C:\Users\Niyamat\Documents\Testing3\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\21.0.0-rc1\AndroidManifest.xml
  </code></pre>
  
  <p>I know there are some question about the same error but I didn't find any good solution.
  So please someone help me?</p>