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Not all image files have that extension. An extension is NOT required for a file.

That is where a SSCCE is useful. Instead of having to copy and work with this huge program that has tons of missing parts: the images and the Expo class, a small program that only works on the...

Try adding some println statements to the code to show the values of variables as they change and to show execution flow. Look in the browser's Java console for the output.

Where is the Expo class?