Eclipse – “An internal error occurred during: “Launching …”. java.lang.NullPointerException”

After deleting an ADV or changing Android Project target when you run or debug show the following error message:

An internal error occurred during: “Launching {project name}”.
java.lang.NullPointerException

Solution:

1) Launch ADV Manager, verify if there is an AVD for your Android Project target else create an ADV for your Target (Click on New… button, enter a Name, select your Target then press Create ADV button)
2) Run Eclipse, right-click on your Android Project name in the Package Explorer window
3) Select Properties or press Alt+Enter
4) Click on Run/Debug Settings then select your project name and click Edit
5) Select Target tab
6) Click on Automatic mode and press Refresh button

If you have more AVD for the same Target:
– Select the checkbox the ADV verified or created at point 1) then click on Manual mode

7) Press Apply button then OK button

Now you can run or debug your Android Project.

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