Proguard say input jar file is specified twice

Question

I create app with Google Translator. I try create signed apk with Proguard.

proguard.cfg contain:

-libraryjars libs/gtranslateapi-1.0.jar
-keep class com.gtranslate.** { *; }

proguard-project.txt contain:

-dontwarn com.gtranslate.**

Also I try without proguard-project.txt:

# -dontwarn com.gtranslate.**

But I get error:

Proguard returned with error code 1. See console
Error: The same input jar [C:\workspace\myproject\libs\gtranslateapi-1.0.jar] is specified twice.

What is incorrect?

Answer 1

Remove -libraryjars libs/gtranslateapi-1.0.jar from your proguard.cfg file.