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The ROM Crashes after putting EXGFX.

I applied some patch and put right freespace and it worked well.

and I keep working on my hack, as I inserted ExGFX, the message appeared.

"The ROM Crashed. Technical information:586"
I already backed-up my hack so that's a relief!

What Should I do to solve the problem?
Receiving?
First, check if it works in an external emulator. The internal one is rather fragile.

If it works there, close and reopen LM in case. Maybe it remembers parts of the old ROM in some odd way.
If it does not work, maybe the freespace wasn't right after all. Which patch was it, and how big was the freespace?
<blm> zsnes users are the flatearthers of emulation