Cannot compile support-v4 lib with Android Studio - android-studio

Question

I migrate my android app from eclipse to Android Studio. During this "migration" I decided to split my project in 4 modules: GUI module, engine module, commons module and resources module.
The problem is that I cannot include v4 or v7 libs... It does not recognize the import:"import android.support.v4."
Below are the gradles:
1.Genral Gradle:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.1.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
1.Gradle for GUI module(main module):
apply plugin: 'com.android.application'
dependencies {
compile 'com.android.support:support-v4:+'
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.0.0'
compile project(':audiorecengine')
compile 'com.google.android.gms:play-services:7.0.0'
}
android {
compileSdkVersion 22
buildToolsVersion "22.0.0"
defaultConfig {
applicationId "com.audioRec"
minSdkVersion 10
targetSdkVersion 22
versionCode 73
versionName "4.0.4"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
productFlavors {
lite {
applicationId = "com.audioRec"
versionCode 73
versionName "4.0.4"
}
pro {
applicationId = "com.audioRec.pro"
versionCode 13
versionName "3.0.3"
}
}
}
Gradle for engine module:
apply plugin: 'com.android.library'
android {
compileSdkVersion 22
buildToolsVersion "22.0.0"
defaultConfig {
minSdkVersion 11
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.0.0'
compile project(':audioreccommons')
}

Answer 1

It appears that the issue was caused by GooglePlayService lib which already contained the v4 support library. The solution was to exclude support-v4 when compiling playServices.
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile project(':audiorecengine')
compile ('com.google.android.gms:play-services:7.0.0'){
exclude module: 'support-v4'
}
}
Also I removed v4 from gradle dependency because it is already contained by the v7 support lib