Runtime Exception when opening settings

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Salam,
When i build the current project with maven i have a runtime exception when i open the settings in first i thought i was only my configuration, but i tried in an other machine and i have the problem, even on different version of android in the emulator. no one notice? i tried to fix it my self for a while, but i couldn't, can i have some help please.

This is the logcat:

01-15 18:05:20.314: I/ActivityManager(51): Starting activity: Intent { cmp=com.quran.labs.androidquran/.QuranPreferenceActivity }
01-15 18:05:20.463: D/AndroidRuntime(202): Shutting down VM
01-15 18:05:20.463: W/dalvikvm(202): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
01-15 18:05:20.463: E/AndroidRuntime(202): Uncaught handler: thread main exiting due to uncaught exception
01-15 18:05:20.483: E/AndroidRuntime(202): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.quran.labs.androidquran/com.quran.labs.androidquran.QuranPreferenceActivity}: android.view.InflateException: Binary XML file line #105: Error inflating class com.quran.labs.androidquran.widgets.SeekBarPreference
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.os.Handler.dispatchMessage(Handler.java:99)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.os.Looper.loop(Looper.java:123)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread.main(ActivityThread.java:4363)
01-15 18:05:20.483: E/AndroidRuntime(202): at java.lang.reflect.Method.invokeNative(Native Method)
01-15 18:05:20.483: E/AndroidRuntime(202): at java.lang.reflect.Method.invoke(Method.java:521)
01-15 18:05:20.483: E/AndroidRuntime(202): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
01-15 18:05:20.483: E/AndroidRuntime(202): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
01-15 18:05:20.483: E/AndroidRuntime(202): at dalvik.system.NativeStart.main(Native Method)
01-15 18:05:20.483: E/AndroidRuntime(202): Caused by: android.view.InflateException: Binary XML file line #105: Error inflating class com.quran.labs.androidquran.widgets.SeekBarPreference
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:441)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.rInflate(GenericInflater.java:493)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.inflate(GenericInflater.java:326)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.inflate(GenericInflater.java:263)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:254)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:253)
01-15 18:05:20.483: E/AndroidRuntime(202): at com.quran.labs.androidquran.QuranPreferenceActivity.onCreate(QuranPreferenceActivity.java:26)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
01-15 18:05:20.483: E/AndroidRuntime(202): ... 11 more
01-15 18:05:20.483: E/AndroidRuntime(202): Caused by: java.lang.ClassNotFoundException: com.quran.labs.androidquran.widgets.SeekBarPreference in loader dalvik.system.PathClassLoader@43b87ff0
01-15 18:05:20.483: E/AndroidRuntime(202): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
01-15 18:05:20.483: E/AndroidRuntime(202): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
01-15 18:05:20.483: E/AndroidRuntime(202): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.createItem(GenericInflater.java:375)
01-15 18:05:20.483: E/AndroidRuntime(202): at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:430)
01-15 18:05:20.483: E/AndroidRuntime(202): ... 20 more
01-15 18:05:20.503: I/Process(51): Sending signal. PID: 202 SIG: 3
01-15 18:05:20.513: I/dalvikvm(202): threadid=7: reacting to signal 3
01-15 18:05:20.513: E/dalvikvm(202): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
01-15 18:05:30.357: W/ActivityManager(51): Launch timeout has expired, giving up wake lock!
01-15 18:05:30.429: W/ActivityManager(51): Activity idle timeout for HistoryRecord{43d12ff0 com.quran.labs.androidquran/.QuranPreferenceActivity}

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is there a dev mailing-list or a chat or something ?

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I solved it by adding this lines to the proguard.cfg
-keep class * extends android.preference.DialogPreference {
public (android.content.Context);
public (android.content.Context, android.util.AttributeSet);
public (android.content.Context, android.util.AttributeSet, int);
public void set*(...);
}

thanks to this question http://stackoverflow.com/questions/7904517/classnotfoundexception-in-release-build