On installation eclipse was working fine, but after updating support library and some other packages I get an error in appcompat folder in many theme files in the values folders in appcompat. Also no activity is created by default after this. Usually one hello world project used to open with an ActionBarActivity named MainActivity and layout file named activity_main. I had checked create activity in the new android application wizard and took blank activity.
What should be done to create an error free hello world project by default?