View Compilation Error

0_0_38381489_7599.cpp: In function 'void calc(long long int)':
0_0_38381489_7599.cpp:49:50: error: request for member 'B' in 'mod', which is of non-class type 'const long long int'
  for(int i=0;i<=SIZ;i++)ans[i]=(ans[i]+B[i])%mod.B[i]=0;
                                                  ^