View Compilation Error

0_0_9450723_27577.cpp:10: error: size of array `tree' is too large
0_0_9450723_27577.cpp: In function `node* CreateNode()':
0_0_9450723_27577.cpp:15: error: `tree' undeclared (first use this function)
0_0_9450723_27577.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)