Unfortunatley My First App Has Stopped In Emulator

I'm trying the first tutorial on Android's official website. This is to showcase a message when clicking on send, but when I click send I get an error. I have tried certain questio

Solution 1:

Unable to find explicit activity class {com.example.myfirstapp/com.example.myfirstapp.DisplayMessageActivity}; have you declared this activity in your AndroidManifest.xml?

so make sure you have declared DisplayMessageActivity in AndroidManifest as :

<activityandroid:name="com.example.myfirstapp.DisplayMessageActivity"></activity>