```08-25 12:29:02.909 27129-27129/com.shop440 E/AndroidRuntime: FATAL EXCEPTION: main
                                                             Process: com.shop440, PID: 27129
                                                             java.lang.NoClassDefFoundError: Failed resolution of: Lcom/shop440/Utils/Urls;
                                                                 at com.shop440.MainActivity.onCreate(MainActivity.java:40)
                                                                 at android.app.Activity.performCreate(Activity.java:6178)
                                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
                                                                 at android.app.ActivityThread.access$900(ActivityThread.java:177)
                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                 at android.os.Looper.loop(Looper.java:135)
                                                                 at android.app.ActivityThread.main(ActivityThread.java:5910)
                                                                 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:1405)
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
                                                              Caused by: java.lang.ClassNotFoundException: Didn't find class "com.shop440.Utils.Urls" on path: DexPathList[[zip file "/data/app/com.shop440-2/base.apk", zip file "/data/app/com.shop440-2/split_lib_dependencies_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_0_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_1_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_2_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_3_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_4_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_5_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_6_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_7_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_8_apk.apk", zip file "/data/app/com.shop440-2/split_lib_slice_9_apk.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 com.shop440.MainActivity.onCreate(MainActivity.java:40) 
                                                                 at android.app.Activity.performCreate(Activity.java:6178) 
                                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648) 
                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) 
                                                                 at android.app.ActivityThread.access$900(ActivityThread.java:177) 
                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) 
                                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                 at android.os.Looper.loop(Looper.java:135) 
                                                                 at android.app.ActivityThread.main(ActivityThread.java:5910) 
                                                                 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:1405) 
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 
                                                             	Suppressed: java.lang.ClassNotFoundException: com.shop440.Utils.Urls
                                                                 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)
                                                                 		... 15 more
                                                              Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
```