Dex error On Android Studio 3.0 Beta4

I have same problem with Android Studio 3.0 beta 4. I found a solution.

1. From the Build menu, press the Clean Project button.

2. After task completed, press the Rebuild Project button from the Build menu.

For Android Studio 3.0 what I did was to add this to my gradle:

multiDexEnabled true

And it worked!

Example

android {    compileSdkVersion 25    buildToolsVersion '26.0.2'    defaultConfig {        applicationId "com.xx.xxx"        minSdkVersion 15        targetSdkVersion 24        versionCode 9        versionName "1.0"        multiDexEnabled true //Add this        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            shrinkResources true            minifyEnabled true            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }}

So I solved this issue by doing the following:

• Delete the ./gradle folder inside your project
• Delete all the build folders and the gradle cache. I ran the following command:

How ?

 cd ~/[your project root folder] && find . -name build -exec rm -rf {} \; && rm -rf $HOME/.gradle/caches/

Assuming your gradle config files are in the $HOME/.gradle folder.

• Inside Android Studio, went to File > Invalidate caches / Restart... and invalidated the caches and restarted it.