"checksum bad" error loading rom with hack Snes9x

I have been using the Snes9x emulator to run Super Metroid for some years now. Today, I discovered hacks and have been experimenting with Hyper Metroid, for example. I have downloaded Lunar IPS to apply the hacks to the roms.

While I got Hyper Metroid to work, I am having trouble getting the infamous Justin Bailey hack to work. Every time I try to run it I get some yellow text saying "checksum bad", and a jumbled up Nintendo logo in the middle. Nothing else happens, unless I load a saved state. Even though I can still play the game, Samus leaves something to be desired.

Anyone know how to fix this?