$//$ Call base class method $//$ Additional functionality for ExtendedAVLTree $\}\}$; In file included from main.cpp:$6$: ExtendedAVLTree.h: In member function $$void ExtendedAVLTree::Insert$($int$)$: ExtendedAVLTree.h:$10$:$18$: error: $$Insert$$ is not a member of $$AVLTree$10|$ AVLTree::Insert$($key$)$; $|^$~~~~~ ExtendedAVLTree.h: In member function $$void ExtendedAVLTree::Remove$($int$)$: ExtendedAVLTree.h:$15$:$18$: error: $$Remove$$ is not a member of $$AVLTree$15|$ AVLTree::Remove$($key$)$; $|^$~~~~~