View Compilation Error

0_0_37450220_9990.cpp:38:11: error: variable or field 'Free' declared void
 void Free(tr* p)
           ^
0_0_37450220_9990.cpp:38:11: error: 'tr' was not declared in this scope
0_0_37450220_9990.cpp:38:15: error: 'p' was not declared in this scope
 void Free(tr* p)
               ^
0_0_37450220_9990.cpp: In function 'int main()':
0_0_37450220_9990.cpp:62:14: error: 'Free' was not declared in this scope
     Free(root);
              ^