In file included from /in/ex6.cpp:1:0:
/in/ex6.h:140:7: error: extra qualification 'BinaryTree::' on member 'sumHelper' [-fpermissive]
   int BinaryTree::sumHelper(TreeNode *node) const;
       ^~~~~~~~~~
/in/ex6.h:142:7: error: extra qualification 'BinaryTree::' on member 'depthHelper' [-fpermissive]
   int BinaryTree::depthHelper(TreeNode *node) const;
       ^~~~~~~~~~
/in/ex6.h:144:8: error: extra qualification 'BinaryTree::' on member 'inOrderTraversal' [-fpermissive]
   void BinaryTree::inOrderTraversal(std::ostream &os, TreeNode *node) const ;
        ^~~~~~~~~~
/in/compile/Makefile:69: recipe for target 'ex6.o' failed
make: *** [ex6.o] Error 1