I am not able to build Aidl Library.  

Error: 

> 
>   
> Error:Execution failed for task ':app:compileDebugAidl'.
>  java.lang.RuntimeException: com.android.ide.common.process.ProcessException: Error while executing   
>  'D:\mysdk\Android\android-sdk\build-tools\22.0.1\aidl.exe' with arguments   
> {-pD:\mysdk\Android\android-sdk\platforms\android-21\framework.aidl -...
>    
> dC:\Users\admin\AppData\Local\Temp\aidl6013369886374174489.d ...\dev\myaidllibrary\ICoffeeMakerRemoteService.aidl}
> 
> 
> 

build.gradle:

```
apply plugin: 'com.android.library'
apply plugin: 'com.neenbedankt.android-apt'
android {
    compileSdkVersion 21
    buildToolsVersion '22.0.1'
    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:21.0.0'
    testCompile 'junit:junit:4.12'
    provided 'com.google.auto.value:auto-value:1.2-rc1'
    // needed for Android Studio
    apt 'com.google.auto.value:auto-value:1.2-rc1'
    apt 'com.ryanharter.auto.value:auto-value-parcel:0.2.0'
}

```

Directory Structure:

> 
> aidl->  
> 
>  ICoffeeMakerRemoteService.aidl  
> 
>  Ingredient.aidl  
> 
>  java->  
> 
>  Ingredient.java
> 
> 
> 

I'm stuck with these, tried possible solutions.