This can happen when an image file is corrupted in some way. If you can, open it in your image editor of choice and re-save it. This should fix the problem. Check also, that you can load images from the tutorial installed with Stitcher.
This can also happen if the image doesn’t have the same size in pixels. Or it can happen if some of the images are at different orientations. Sometimes the camera’s sensors will record some images’ orientation as being landscape when the rest are portrait, usually when you are shooting the bottom and top (also known as Nadir and Zenith respectively) images in a spherical panorama. All you need to do is to make sure that they are all at the same orientation. You can either rotate them manually in your graphics editing program, or you can change your camera’s settings to not record orientation information with each image (not available in all cameras).
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