android - Unable to instantiate activity + Caused by: java.lang.ClassNotFoundException: +Suppressed: java.io.IOException: unable to open DEX file -

i have got problem classnotfound exception, think package name problem don't know how solve it.

java.lang.runtimeexception: unable instantiate activity componentinfo{com.starxsoft.estimatedusedpower/com.starxsoft.estimatedusedpower.mainbattestimatedpoweractivity}: java.lang.classnotfoundexception: didn't find class "com.starxsoft.estimatedusedpower.mainbattestimatedpoweractivity" on path: dexpathlist[[zip file "/mnt/asec/com.starxsoft.estimatedusedpower-2/pkg.apk"],nativelibrarydirectories=[/mnt/asec/com.starxsoft.estimatedusedpower-2/lib, /vendor/lib, /system/lib]]     @ android.app.activitythread.performlaunchactivity(activitythread.java:2264)     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)     @ android.app.activitythread.access$800(activitythread.java:151)     @ android.app.activitythread$h.handlemessage(activitythread.java:1321)     @ android.os.handler.dispatchmessage(handler.java:110)     @ android.os.looper.loop(looper.java:193)     @ android.app.activitythread.main(activitythread.java:5299)     @ java.lang.reflect.method.invokenative(native method)     @ java.lang.reflect.method.invoke(method.java:515)     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825)     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641)     @ dalvik.system.nativestart.main(native method) caused by: java.lang.classnotfoundexception: didn't find class "com.starxsoft.estimatedusedpower.mainbattestimatedpoweractivity" on path: dexpathlist[[zip file "/mnt/asec/com.starxsoft.estimatedusedpower-2/pkg.apk"],nativelibrarydirectories=[/mnt/asec/com.starxsoft.estimatedusedpower-2/lib, /vendor/lib, /system/lib]]     @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)     @ java.lang.classloader.loadclass(classloader.java:497)     @ java.lang.classloader.loadclass(classloader.java:457)     @ android.app.instrumentation.newactivity(instrumentation.java:1061)     @ android.app.activitythread.performlaunchactivity(activitythread.java:2255)     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)      @ android.app.activitythread.access$800(activitythread.java:151)      @ android.app.activitythread$h.handlemessage(activitythread.java:1321)      @ android.os.handler.dispatchmessage(handler.java:110)      @ android.os.looper.loop(looper.java:193)      @ android.app.activitythread.main(activitythread.java:5299)      @ java.lang.reflect.method.invokenative(native method)      @ java.lang.reflect.method.invoke(method.java:515)      @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825)      @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641)      @ dalvik.system.nativestart.main(native method)  suppressed: java.io.ioexception: unable open dex file     @ dalvik.system.dexfile.opendexfilenative(native method) 

i had cleaned & rebuilt project , manifest file follows, package name defined in mainfest , class also:

<?xml version="1.0" encoding="utf-8"?>     <manifest package="com.starxsoft.estimatedusedpower"         xmlns:android="http://schemas.android.com/apk/res/android">         <uses-permission android:name="android.permission.access_fine_location"/>         <uses-permission android:name="android.permission.access_wifi_state"/>         <application             android:allowbackup="true"             android:icon="@mipmap/ic_launcher"             android:label="@string/app_name"             android:supportsrtl="true"             android:theme="@style/apptheme">             <activity                 android:name=".mainbattestimatedpoweractivity"                 android:label="@string/app_name"                 android:theme="@style/apptheme.noactionbar"                 android:screenorientation="portrait">                 <intent-filter>                     <action android:name="android.intent.action.main"/>                     <category android:name="android.intent.category.launcher"/>                 </intent-filter>             </activity>