View Compilation Error

0_0_14824637_25318.cpp:9:30: error: 'M' was not declared in this scope
 ll powMod(ll a, ll b, ll m = M) {
                              ^
0_0_14824637_25318.cpp:19:30: error: 'M' was not declared in this scope
 ll mulMod(ll a, ll b, ll m = M) {
                              ^
0_0_14824637_25318.cpp: In function 'll CRT(ll*, ll*, int)':
0_0_14824637_25318.cpp:58:16: error: 'M' was not declared in this scope
   ll x, y, t = M / m[i];
                ^