The new,delete operation error of BDB C++ object

My environment is:
  OS: Windows XP,VC6(sp4),db-4.5.20

  The sample code is
  {
     Db *pDb=new Db(NULL,0);
     delete pDb;    //Here will catch one heap error.
  }

  I don't konw I use it in wrong way or I need compile file with
special macro definition.