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java.lang.NoClassDefFoundError: com.facebook.FacebookActivity	at dalvik.system.DexFile.defineClassNative(Native Method)	at dalvik.system.DexFile.defineClass(DexFile.java:226)	at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)	at dalvik.system.DexPathList.findClass(DexPathList.java:321)	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)