I noticed that Launch4j's GUI seems to prefer a bmp file, so I used Gimp to convert my jpg file into that format, but I kept getting the error when trying to run the executable generated by Launch4j.
I was on the right track by converting my jpg file into a bmp file. The Launch4j GUI allows you to choose any file for the Splash file, but it requires a 24-bit bmp file.
Initially, when I converted my file with Gimp, I converted it into a 32-bit bmp file. This was the cause of my problem. I reconverted the image using Gimp's default value of 24-bits and now the executable that Launch4j creates will run without an error.
Make sure the following options are selected when exporting the BMP in GIMP:
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