specification file ads problem

[Stribor40 <ikamzic@gmail.com>]

I am trying to put this in spec file...
***********************************************************
generic
  type myType is array (1 ..N-1) of String (1..N);
  N : Integer;
 
package myPackage is
     function tt (a : in String) return myType;
end Neighbours;

************************************************************
Then in body.....

package body myPackage is
 myNewType : myType; 

     function tt (a : in String) return myType is
        begin
      --
      --

      return myNewType;
        end tt;


end myPackage;
*****************************************************************************
actual file that i compile and use to test this,,,

with Ada.Text_IO, Ada.Command_Line, myPackage;
 
  
   procedure testing is
   
  
  begin
   Null;
  end testing;
***************************************************************************

I am getting all these type errors..what am i doing wrong here? How do i spec file specify function return type when my spec file doesnt know about it?