Unable to execute dex: Multiple dex files define Landroid/support/v7/appcompat

Question

I am getting below exception when I try to run my project:

[2014-09-29 11:56:32 - Dex Loader] Unable to execute dex: Multiple dex files define Landroid/support/v7/appcompat/R$anim;
[2014-09-29 11:56:32 - PageViewers] Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define Landroid/support/v7/appcompat/R$anim;

Answer 1

you have twice compat library

So, how I solved this problem:

1. Import support library as a project from "sdk/extras/android/support/v7/appcompat".
2. Reference library in your project (for Eclipse, "Properties - Android - Add").
3. Build projects (for Eclipse, "Projects - Build All"). Make sure, you have "android.support.v7.appcompat" in your main project gen folder.
4. If it doesn't worked - clean and rebuild project.

Answer 2

I tried a lot but finally I solved it by executing

cd android && ./gradlew clean

refer github issue.