کرش کردن برنامه بدون اینکه خطایی داشته باشد.

سلام دوستان . 

برنامه رو نوشتم ، این ارور رو بهم میده. به log ها هم حتی نمیرسه .

 2947/com.example.hasan6.test E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.hasan6.test, PID: 2947
 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.hasan6.test/com.example.hasan6.test.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.hasan6.test.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.hasan6.test-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2236)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
 at android.app.ActivityThread.access$800(ActivityThread.java:151)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:135)
 at android.app.ActivityThread.main(ActivityThread.java:5254)
 at java.lang.reflect.Method.invoke(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:372)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.hasan6.test.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.hasan6.test-1/base.apk"],nativeLibraryDirectories=[/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:1066)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2226)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
 at android.app.ActivityThread.access$800(ActivityThread.java:151) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:135) 
 at android.app.ActivityThread.main(ActivityThread.java:5254) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at java.lang.reflect.Method.invoke(Method.java:372) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
 Suppressed: java.lang.ClassNotFoundException: Didn't find class "com.example.hasan6.test.MainActivity" on path: DexPathList[[dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-support-annotations-27.1.1_8da34b85cc069485d2f70e12e524f9c6976b62f1-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-exp4j-0.4.8_f20a2c08ac53a3534056f86224ac2a428822747e-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-common-1.1.0_39aa9d61ee2be36c570d65606c34b7970f607d3e-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-common-1.1.0_11589892b170e1e1e11650853f77894efe6981b2-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-com.android.support-support-vector-drawable-27.1.1_782c650505055501911f65dbcee9ee70c5e6d623-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-com.android.support-support-fragment-27.1.1_b533948bb7dafc1ec7259321460fac86de9acb4d-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-com.android.support-support-core-utils-27.1.1_b56fea4ca9dec89cde2961a1cd143680c3dd03e7-classes.dex", dex file "/data/data/com.example.hasan6.test/files/instant-run/dex/slice-com.android.support-support-core-ui-27.1.1_b3468142227541d55a650cbccfa323607cae5fc