View Compilation Error

0_0_24438385_14482.cpp: In function 'll inv(ll)':
0_0_24438385_14482.cpp:8:26: error: too many arguments to function 'll inv(ll)'
     return inv(mod%a, mod) * (mod-mod/a) % mod;
                          ^
0_0_24438385_14482.cpp:6:4: note: declared here
 ll inv(ll a) {
    ^