parseSdkContent failed Could not initialize class android.graphics.Typeface

Problem:
When open layout editor, eclipse is giving this error:

parseSdkContent failed
Could not initialize class android.graphics.Typeface

And when try to run project, it is giving this error :

An internal error occurred during: "Launching myapp".
java.lang.NullPointerException

Solution:
Delete the home/.android folder and everything is normal now.
In Windows you can find this folder in C:/Users/User/