View Compilation Error

0_0_38707840_24487.cpp: In function 'int main()':
0_0_38707840_24487.cpp:25:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   25 |         ans = ((fm(m,n + 1) - 1) * fm(m - 1,mod - 2) % mod + mod) % mod;
      |         ^~~
      |         abs