View Compilation Error

0_0_38496375_22746.cpp: In function 'void CreateUDN(AMGraph&)':
0_0_38496375_22746.cpp:35:28: error: 'LocateVex' was not declared in this scope
         i = LocateVex(G, v1);  
                            ^
0_0_38496375_22746.cpp: In function 'int main()':
0_0_38496375_22746.cpp:58:36: error: 'LocateVex' was not declared in this scope
     num_start = LocateVex(G , start);
                                    ^