我有一个在发布版本（签名应用程序版本）中编译的安卓应用程序就好了。我已经升级到 Flurry Analytics 6.1.0，现在在发布 APK 时遇到很多错误。
错误是：
3:05:56 - MyApp] Proguard returned with error code 1. See console
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$1$1: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.Post$2: can't find referenced class com.flurry.sdk.dz$a
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ej
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ff
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.gz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ej
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ej
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ej
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ej
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.ff
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.gz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.gz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.android.tumblr.TumblrShare: can't find referenced class com.flurry.sdk.gz
[2015-10-09 13:05:56 - MyApp] Warning: com.flurry.sdk.lw: can't find referenced class com.flurry.sdk.i
[2015-10-09 13:05:56 - MyApp] You should check if you need to specify additional program jars.
[2015-10-09 13:05:56 - MyApp] Warning: there were 35 unresolved references to classes or interfaces.
[2015-10-09 13:05:56 - MyApp] You may need to specify additional library jars (using '-libraryjars').
[2015-10-09 13:05:56 - MyApp] java.io.IOException: Please correct the above warnings first.
[2015-10-09 13:05:56 - MyApp] at proguard.Initializer.execute(Initializer.java:321)
[2015-10-09 13:05:56 - MyApp] at proguard.ProGuard.initialize(ProGuard.java:211)
[2015-10-09 13:05:56 - MyApp] at proguard.ProGuard.execute(ProGuard.java:86)
[2015-10-09 13:05:56 - MyApp] at proguard.ProGuard.main(ProGuard.java:492)
新版本的库会破坏应用程序，这很烦人。至少，他们应该对此提出一些警告。
这是什么错误？为什么它们会出现，最重要的是，如何摆脱它们？