View Compilation Error

0_0_2547914_17838.cpp: In function `int main()':
0_0_2547914_17838.cpp:64: error: `Timer' undeclared (first use this function)
0_0_2547914_17838.cpp:64: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2547914_17838.cpp:64: error: expected `;' before "t"