Android proguard, mapping.txt not working so well

I am using the retrace.bat file to check some stack traces from clients.

The problem is that the output does not really look like they did before, there are no line numbers and there is the word void appended 开发者_如何学运维to class names and (Unknown Source) where line numbers should be. Is this normal?

Add the following to your proguard conf file

-renamesourcefileattribute ProGuard

-keepattributes SourceFile,LineNumberTable

Source