Android Error: Caused By: Java.lang.classnotfoundexception

I'm extremely new on Android Development, this is my first app. I try to run an app on a device or an emulator and I get 'Unfortunately, app name has stopped'. I believe the error

Solution 1:

in your manifest , the main package name is com.benchaful.newboard :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.benchaful.newboard"
  android:versionCode="1"
  android:versionName="1.0">

And on the declaration of your Activity , you have com.benchaful.newBoard ( with B uppercase) , i think that it's just a syntax error when you are tapping the name of your package.you should declare your activity like this :

<activityandroid:name="com.benchaful.newboard.MainActivity"android:label="@string/app_name"android:screenOrientation="portrait">

or :

<activityandroid:name=".MainActivity"android:label="@string/app_name"android:screenOrientation="portrait">

Solution 2:

Sorry if this is obvious but make sure you have a class called MainActivity, which extends Activity.

And that its package name is com.benchaful.newBoard.MainActivity