title: Gradle task error occurred in android studio project
body: <p>My project was running successfully. But suddenly I am getting the following error after the build finished. </p>
  
  <p>Can anyone tell me what is going on here? I have no idea about this error. How should I fix it? </p>
  
  <pre><code>Error:A problem occurred configuring project ':app'.
  &gt; Could not resolve all dependencies for configuration ':app:_debugCompile'.
     &gt; Could not find com.android.support:cardview-v7:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified
     &gt; Could not find com.android.support:support-v4:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.facebook.android:facebook-android-sdk:4.11.0
     &gt; Could not find com.android.support:cardview-v7:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/cardview-v7/23.2.1/cardview-v7-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.facebook.android:facebook-android-sdk:4.11.0
     &gt; Could not find com.android.support:customtabs:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/customtabs/23.2.1/customtabs-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/customtabs/23.2.1/customtabs-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/customtabs/23.2.1/customtabs-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/customtabs/23.2.1/customtabs-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/customtabs/23.2.1/customtabs-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/customtabs/23.2.1/customtabs-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/customtabs/23.2.1/customtabs-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/customtabs/23.2.1/customtabs-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.facebook.android:facebook-android-sdk:4.11.0
     &gt; Could not find com.android.support:support-v4:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.android.support:recyclerview-v7:23.2.0
           FinderMaterial:app:unspecified &gt; com.android.support:design:23.2.0
           FinderMaterial:app:unspecified &gt; com.android.support:appcompat-v7:23.2.0
           FinderMaterial:app:unspecified &gt; com.android.support:appcompat-v7:23.2.0 &gt; com.android.support:support-vector-drawable:23.2.0
     &gt; Could not find com.android.support:support-v4:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.flipboard:bottomsheet-core:1.5.0
           FinderMaterial:app:unspecified &gt; com.flipboard:bottomsheet-commons:1.5.0
           FinderMaterial:app:unspecified &gt; com.github.citux:datetimepicker:0.2.0 &gt; com.android.support:support-v13:23.1.1
     &gt; Could not find com.android.support:support-v4:23.2.1.
       Searched in the following locations:
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://jcenter.bintray.com/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           https://repo1.maven.org/maven2/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/android/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.pom
           file:/opt/android-sdk-linux/extras/google/m2repository/com/android/support/support-v4/23.2.1/support-v4-23.2.1.jar
       Required by:
           FinderMaterial:app:unspecified &gt; com.google.android.gms:play-services:8.4.0 &gt; com.google.android.gms:play-services-basement:8.4.0
  </code></pre>
  
  <p>Thanks in advance.</p>