View Compilation Error

0_0_17972359_24341.cpp: In function 'int main()':
0_0_17972359_24341.cpp:91:8: error: 'ill' was not declared in this scope
        ill tt = min (xx, yy) - kk;
        ^
0_0_17972359_24341.cpp:92:28: error: 'tt' was not declared in this scope
        dp[i] -= (lucas(kk, tt) * dp[j]) % mod;
                            ^