Error Proguard when signing Android Aplication

I was try to signing my Android Application with Proguard but have error like this

[2015-01-28 12:04:22 - PriestsNDevils-android] Proguard returned with error code 1. See console
[2015-01-28 12:04:22 - PriestsNDevils-android] Warning: com.badlogic.gdx.sqlite.android.AndroidCursor: can't find referenced method 'void log(java.lang.String,java.lang.String,java.lang.Exception)' in class com.badlogic.gdx.Application
[2015-01-28 12:04:22 - PriestsNDevils-android]       You should check if you need to specify additional program jars.
[2015-01-28 12:04:22 - PriestsNDevils-android] Warning: there were 1 unresolved references to program class members.
[2015-01-28 12:04:22 - PriestsNDevils-android]          Your input classes appear to be inconsistent.
[2015-01-28 12:04:22 - PriestsNDevils-android]          You may need to recompile them and try again.
[2015-01-28 12:04:22 - PriestsNDevils-android]          Alternatively, you may have to specify the option 
[2015-01-28 12:04:22 - PriestsNDevils-android]          '-dontskipnonpubliclibraryclassmembers'.
[2015-01-28 12:04:22 - PriestsNDevils-android] java.io.IOException: Please correct the above warnings first.
[2015-01-28 12:04:22 - PriestsNDevils-android]  at proguard.Initializer.execute(Initializer.java:321)
[2015-01-28 12:04:22 - PriestsNDevils-android]  at proguard.ProGuard.initialize(ProGuard.java:211)
[2015-01-28 12:04:22 - PriestsNDevils-android]  at proguard.ProGuard.execute(ProGuard.java:86)
[2015-01-28 12:04:22 - PriestsNDevils-android]  at proguard.ProGuard.main(ProGuard.java:492)

what must i do ?.