View Compilation Error

0_0_21398639_4236.cpp: In function 'int main()':
0_0_21398639_4236.cpp:48:57: error: invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
    c[i] = (c[i - 1] * i) % Mod * exgcd(i - n + K, Mod, 1) % Mod;
                                                         ^
0_0_21398639_4236.cpp:16:13: note: in passing argument 3 of 'void exgcd(int, int, int&, int&, int&)'
 inline void exgcd(int a, int b, int& d, int &x, int &y){
             ^