View Compilation Error

0_0_30404896_5927.cpp: In function 'LL GGG(LL)':
0_0_30404896_5927.cpp:55:40: error: 'nv6' was not declared in this scope
     LL ans=1ll*n*(n+1)%Mod*(2*n+1)%Mod*nv6%Mod;
                                        ^