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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_onms8la56mqettrhife2vvjvrd, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static Pt firstDifferingPixel(BufferedImage img1, BufferedImage etc img2) {
  assertSameSize(img1, img2);
  int w = img1.getWidth(), h = img1.getHeight();
  for y to h:
    for x to w:
      if (getPixel(img1, x, y) != getPixel(img2, x, y))
        ret pt(x, y);
  null;
}