View Compilation Error

0_0_18319574_18779.cpp: In function 'void ntt(LL*, int, int)':
0_0_18319574_18779.cpp:60:25: error: 'i' was not declared in this scope
   LL wn=exp(G, (mod-1)/(i<<1), mod), w=1;
                         ^
0_0_18319574_18779.cpp:62:24: error: 'w' was not declared in this scope
   for (int i=0;i<k;i++,w=w*wn)
                        ^