El error de ProGuard no puede encontrar la superclase o la interfaz org.apache.http.entity

Me sale siempre con ProGuard siguiente error:

[2012-05-19 17:50:13 - xxx] Warning: there were 13 unresolved references to      program class members.
[2012-05-19 17:50:13 - xxx]          Your input classes appear to be     inconsistent.
[2012-05-19 17:50:13 - xxx]          You may need to recompile them and try again.
[2012-05-19 17:50:13 - xxx]          Alternatively, you may have to specify the option 
[2012-05-19 17:50:13 - xxx]          '-dontskipnonpubliclibraryclassmembers'.
[2012-05-19 17:50:13 - xxx] Error: Please correct the above warnings first.
[2012-05-19 17:55:40 - xxx] Proguard returned with error code 1. See console
[2012-05-19 17:55:40 - xxx] Note: there were 239 duplicate class definitions.
[2012-05-19 17:55:40 - xxx] Warning: org.apache.http.entity.mime.FormBodyPart:    can't find superclass or interface org.apache.james.mime4j.message.BodyPart
[2012-05-19 17:55:40 - xxx] Warning: org.apache.http.entity.mime.HttpMultipart: can't find superclass or interface org.apache.james.mime4j.message.Multipart
[2012-05-19 17:55:40 - xxx] Warning: org.apache.http.entity.mime.MinimalField: can't find superclass or interface org.apache.james.mime4j.parser.Field

Mi archivo proguard.cfg es:

-keep class android.support.v4.app.** { *; }
-keep interface android.support.v4.app.** { *; }
-keep class com.actionbarsherlock.** { *; }
-keep interface com.actionbarsherlock.** { *; }

-keepattributes *Annotation*
-keepattributes SourceFile, LineNumberTable

-libraryjars /libs/crittercism_v2_0_1.jar
-libraryjars /libs/dropbox-android-sdk-1.2.2.jar
-libraryjars /libs/FlurryAgent.jar
-libraryjars /libs/httpmime-4.0.3.jar
-libraryjars /libs/json_simple-1.1.jar

Ya he agregado todas mis bibliotecas externas, ¿por qué siempre obtengo estos errores? ¿Alguien puede ayudar?

EDITAR 21.05.2012: El problema es si agregas el tarro "Dropbox" Y "ActionBarSherlock". Si agrego solo "Dropbox", no tengo ningún problema. Si agrego solo "ActionBarSherlock", no tengo ningún problema. Pero si agrego ambos, obtendré los errores anteriores.

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