title: Allegro 5 assertion fail
body: <p>I am trying to load a bitmap with allegro 5.0.10</p>
  
  <pre><code>ALLEGRO_PATH *path = al_get_standard_path(ALLEGRO_RESOURCES_PATH);
  al_set_path_filename(path, "Bitmap.bmp");
  
  al_init_image_addon();
  ALLEGRO_BITMAP *bmp = al_load_bitmap(al_path_cstr(path, '/'));
  if (!bmp) {
      fprintf(stderr, "No Background.bmp in this directory...");
      return -2;
  }
  
  al_draw_bitmap(bmp, 0, 0, 0);
  </code></pre>
  
  <p>Once i tried to run the program in debug mode, i get this error:</p>
  
  <pre><code>Assertion failed!
  
  Program: c:\allegro\bin\allegro-5.0.10-monolith-md-debug.dll
  File: allegro-git\src\system.c
  Line: 336
  
  Expression: active_sysdrv
  
  ...
  </code></pre>
  
  <p>How do i fix this?</p>