علت یابی خطا

سلام دوستان

برنامه ای نوشتم برای گرفتن یکسری مختصات ، موقع اجرا فورکلوز میشه و تو لوگ خطا های زیر رو میندازه ، ممنون میشم راهنمایی کنید برای رفع خطا :

 10-13 17:39:34.020 1060-1060/ir.rojadev.test.test E/AndroidRuntime: FATAL EXCEPTION: main
 Process: ir.rojadev.test.test, PID: 1060
 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{ir.rojadev.test.test/ir.rojadev.test.test.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "ir.rojadev.test.test.MainActivity" on path: DexPathList[[zip file "/data/app/ir.rojadev.test.test-1/base.apk"],nativeLibraryDirectories=[/data/app/ir.rojadev.test.test-1/lib/x86, /vendor/lib, /system/lib]]
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2358)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2511)
 at android.app.ActivityThread.-wrap11(ActivityThread.java)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1360)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5480)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "ir.rojadev.test.test.MainActivity" on path: DexPathList[[zip file "/data/app/ir.rojadev.test.test-1/base.apk"],nativeLibraryDirectories=[/data/app/ir.rojadev.test.test-1/lib/x86, /vendor/lib, /system/lib]]
 at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
 at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2348)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2511) 
 at android.app.ActivityThread.-wrap11(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1360) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:148) 
 at android.app.ActivityThread.main(ActivityThread.java:5480) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
 Suppressed: java.lang.ClassNotFoundException: ir.rojadev.test.test.MainActivity
 at java.lang.Class.classForName(Native Method)
 at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
 at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
 ... 12 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available