View Compilation Error

0_0_37765593_29659.cpp: In function 'Convex get_convexhull(std::vector<point<double> >)':
0_0_37765593_29659.cpp:353:12: error: could not convert 'st' from 'std::vector<point<double> >' to 'Convex {aka convex<double>}'
     return st;
            ^