eclipse override method error on java 6, compiler 1.6 -

Whenever I try to override a super class method, then the eclipse is causing the error even Common codes are giving errors, this is the first category

  public class first {private zero math () {}}   
 This is the extension of another category  
  second highest of second class {@Override public void meth () {}}   
 and gives eclipse error "method of type meth () Override second The method should be applied to a supertype or "1 quick fix is ​​available - Remove '@ override' annotation" I have already set compiler compliance level to 1.6.    < P> 
 
 1) You can not override   personalize  methods.  
 2) As soon as the eclipse / compiler sees the  @override  description, the relevant  protected (or) public  method in the Super Class, which is not there, is the reason why the compiler Error.