XML : Error retrieving parent for item

I am new in programming android and in my first code i get these errors please help me in solve them.thanks

C:\Users\amir\workspace\HelloWord\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.

C:\Users\amir\workspace\HelloWord\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.