View Compilation Error

0_0_10711250_21867.cpp: In member function `bool node::operator<(const node&) const':
0_0_10711250_21867.cpp:12: error: `ave' undeclared (first use this function)
0_0_10711250_21867.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10711250_21867.cpp:12: error: 'const struct node' has no member named 'ave'