View Compilation Error

0_0_31125282_25709.cpp: In function 'int main()':
0_0_31125282_25709.cpp:480:49: error: invalid initialization of non-const reference of type 'std::vector<point>&' from an rvalue of type '<brace-enclosed initializer list>'
       double tmp=polyarea({p[i-1],p[j-1],p[k-1]});
                                                 ^
0_0_31125282_25709.cpp:238:4: note: in passing argument 1 of 'double polyarea(std::vector<point>&)'
 db polyarea(vector<point>&A){
    ^