Thread: segmentation fault when opening a file

hi guys! pretty new here, just wanted to ask if someone can save me another 5hrs of research - what could cause segmentation fault while i open a file?
ps: it is in the same directory, and i tried entering whole path while starting program,.. nothing helps

thank you A LOT

here is the code:

Code:

int main(int argc, char *argv[])
{
  char *file_name = argv[1];
  if (argc != 2) {
    printf("Usage: ./a4 %s\n", file_name);
    return 1;
  }
  FILE *config_file = fopen(argv[1], "r");
  if (config_file == NULL) {
    printf("Error: Cannot open file: %s\n", file_name);
    return 2;
  }
  printf("opened");

  fclose(config_file);
  return 0;
}