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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_pr86jn76e4ivu1i0lu07q5g5kl, 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 BufferedImage centerImageOnBackground(Color bg, WidthAndHeigth size, BufferedImage img) {
  if (img == null) null;
  BufferedImage canvas = newBufferedImage(size, bg);
  drawImageOnImage(img, canvas,
    (size.w()-img.getWidth())/2,
    (size.h()-img.getHeight())/2));
  ret canvas;
}