View Compilation Error

0_0_24474695_3031.cpp: In function 'vi expr()':
0_0_24474695_3031.cpp:78:4: error: redefinition of 'vi expr()'
 vi expr(){
    ^
0_0_24474695_3031.cpp:26:4: note: 'vi expr()' previously defined here
 vi expr(){;
    ^