Android app:dex:Debug error - cannot seem to solve

Question

please see the link attached for the exact error.

Can run any other android projects, the one I am trying to run simply refuses to work:

https://gyazo.com/bc05c903dddc7dd3b79f9979d6bc42aa

build.gradle

buildscript {
repositories {
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:1.3.0'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    jcenter()
}
}

build.gradle (app)

apply plugin: 'com.android.application'

android { compileSdkVersion 23 buildToolsVersion '23.0.1'

defaultConfig {
    applicationId "com.tapthatstudios.fingersoffury"
    minSdkVersion 21
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"

}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}


}

dependencies {
compile 'com.android.support:support-v4:23.0.0'
compile fileTree(include: ['*.jar'], dir: 'libs')
}