Android 编译错误

本人使用的是Android studio1.3版本，前几天调试通过的项目，现在编译出现了错误。错误信息如下

 Project app: apk dependencies can only be jars. android:mgimlibs:aar:unspecified is an Android Library.
 Project app: apk dependencies can only be jars. com.android.support:appcompat-v7:aar:19.1. is an Android Library.

并没有升级版本，觉得很奇怪。在尝试了许多办法后，终于找到了解决办法

在gradle文件中修改如下代码，将

     apk project(':mgimlibs')
     apk fileTree(include: ['*.jar'], dir: 'libs')

     apk 'com.android.support:appcompat-v7:19.+'
     apk 'com.google.protobuf:protobuf-java:2.6.1'
     apk 'de.greenrobot:eventbus:2.4.0'
     apk 'de.greenrobot:greendao:1.3.7'
     apk 'com.google.code.gson:gson:2.3.1'
     apk 'com.squareup.okhttp:okhttp:2.0.0'
     apk 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
     apk 'commons-io:commons-io:2.4'

修改为：

    apk fileTree(include: ['*.jar'], dir: 'libs')

     compile  'com.google.protobuf:protobuf-java:2.6.1'
     compile  'de.greenrobot:eventbus:2.4.0'
     compile  'de.greenrobot:greendao:1.3.7'
     compile  'com.google.code.gson:gson:2.3.1'
     compile  'com.squareup.okhttp:okhttp:2.0.0'
     compile  'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
     compile  'commons-io:commons-io:2.4'
     compile  'com.android.support:appcompat-v7:19.+'
     compile project(':mgimlibs')

然后在进行编辑就可以通过了。