View Compilation Error

0_0_33321217_9515.cpp: In function 'int main()':
0_0_33321217_9515.cpp:19:30: error: too few arguments to function 'long long int quick_mod(long long int, long long int)'
     cout<<(n+1)*quick_mod(2*n)%mod<<endl;
                              ^
0_0_33321217_9515.cpp:5:4: note: declared here
 ll quick_mod(ll a,ll b){
    ^