Comment 1 for bug 822103

The message stands for "out of memory" while trying to save the file.

MyPaint was trying to create a 3824 x 11072 (127MB) pixbuf, which would be the size of your image. If your image should have been much smaller, you probably made some accidental faint strokes while zoomed out. Check whether your tablet pressure goes to exactly zero when you lift the pen.

The good news: starting with MyPaint 0.9 we no longer allocate such a large pixbuf while saving, and saving is around 5 to 10 times faster than 0.8.

The bad news: we still allocate the same sized pixbuf while loading (but drop it after). And people still occasionally report out of memory when working with huge images.