After I updated the android studio and I run my project, I got this error: NoSuchMethodError: com.google.protobuf.LazyStringArrayList.(Lcom/google/protobuf/LazyStringList;). I cannot build the project. The problem is the old protobuf jar still in lib folder. Then just delete the file, protobuf-2.4.1.jar in [drive]\Program Files (x86)\Android\android-studio\lib. All should be working fine now.