Trouble while compiling a multithreaded code - c++

Question

I've try to compile this code with Visual Studio 2012 but I get the errors below. How can I fix that? And they are due to what? However the program run fine but in singlethreaded mode.
#include <stdio.h>
#include <time.h>
#include <omp.h>
int main() {
double start, end;
double runTime;
start = omp_get_wtime();
int num = 1,primes = 0;
int limit = 1000000;
#pragma omp parallel for schedule(dynamic) reduction(+ : primes)
for (num = 1; num <= limit; num++) {
int i = 2;
while(i <= num) {
if(num % i == 0)
break;
i++;
}
if(i == num)
primes++;
// printf("%d prime numbers calculated\n",primes);
}
end = omp_get_wtime();
runTime = end - start;
printf("This machine calculated all %d prime numbers under %d in %g seconds\n",primes,limit,runTime);
return 0;
}
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Users\Administrator\Documents\Visual Studio 2012\Projects\ConsoleApplication4\x64\Debug\ConsoleApplication4.exe'. Symbols loaded.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\msvcp110d.dll'. Symbols loaded.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\msvcr110d.dll'. Symbols loaded.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\vcomp110d.dll'. Symbols loaded.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\user32.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\gdi32.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\lpk.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\usp10.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\imm32.dll'. Cannot find or open the PDB file.
'ConsoleApplication4.exe' (Win32): Loaded 'C:\Windows\System32\msctf.dll'. Cannot find or open the PDB file.
The thread 0x11f0 has exited with code -1073741510 (0xc000013a).
The program '[4908] ConsoleApplication4.exe' has exited with code -1073741510 (0xc000013a).