View Compilation Error

0_0_26536628_21267.cpp: In member function 'void AC::getfail()':
0_0_26536628_21267.cpp:60:29: error: 'x' was not declared in this scope
                     fail[ch[x][i]]=ch[fail[x]][i];
                             ^
0_0_26536628_21267.cpp:63:25: error: 'x' was not declared in this scope
                 else ch[x][i]=ch[fail[x]][i];
                         ^