AddThis

android SDK error

I'm trying to integrate addThis in my android app but I always get an error.

Thanks

Fabio

Stack trace:
06-11 13:29:37.376: W/System.err(5756): java.lang.NoSuchFieldException: addthisbutton
06-11 13:29:37.376: W/System.err(5756): at java.lang.ClassCache.findFieldByName(ClassCache.java:510)
06-11 13:29:37.376: W/System.err(5756): at java.lang.Class.getField(Class.java:905)
06-11 13:29:37.376: W/System.err(5756): at com.addthis.utils.ATUtil.getResourseIdByName(ATUtil.java:225)
06-11 13:29:37.376: W/System.err(5756): at com.addthis.ui.views.ATButton.initialize(ATButton.java:104)
06-11 13:29:37.376: W/System.err(5756): at com.addthis.ui.views.ATButton.<init>(ATButton.java:93)
06-11 13:29:37.376: W/System.err(5756): at com.addthis.ui.views.ATButton.<init>(ATButton.java:88)
06-11 13:29:37.387: W/System.err(5756): at java.lang.reflect.Constructor.constructNative(Native Method)
06-11 13:29:37.387: W/System.err(5756): at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.createView(LayoutInflater.java:500)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
06-11 13:29:37.387: W/System.err(5756): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
06-11 13:29:37.387: W/System.err(5756): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
06-11 13:29:37.387: W/System.err(5756): at android.app.Activity.setContentView(Activity.java:1622)
06-11 13:29:37.387: W/System.err(5756): at com.tfsolutions.android.per.PastaERicetteActivity.onCreate(PastaERicetteActivity.java:41)
06-11 13:29:37.387: W/System.err(5756): at android.app.Instrumentation.callActivi