View Compilation Error

0_0_15519243_11099.cpp:19:1: error: 'TreeNode' does not name a type
 TreeNode* newNode()
 ^
0_0_15519243_11099.cpp: In function 'TrieNode* createTrieNode()':
0_0_15519243_11099.cpp:26:30: error: 'newNode' was not declared in this scope
     TrieNode *node = newNode();
                              ^