Android : Use a library created in Android Studio in eclipse?

I create a new library with Android Studio. And now I want to use it with Eclipse (because some people use Eclipse for them applications.).

I have tested my jar file from the library in a android project and it's running fine. But when I want to use it with Eclipse I have some errors :

03-26 14:25:59.442: W/System.err(31062): at com.mylib.MyLib.access$000(MyLib.java:24)

03-26 14:25:59.442: W/System.err(31062): at com.mylib.MyLib$2.run(MyLib.java:114)

I don't understand why I don't have no problem with Android Studio and these ones with Eclipse?