I'm no emu coder, but here goes....
That message, in (almost) plain English, means that the instruction/operation [13-4f44213c] found in PC (program counter? maybe..) [bfc00000] is not implemented in the emulator.
The basic idea of how an emulator works is to 'map' processor instructions (in this case, one from a PSX) to another processor instructions (to your PC)... ok some people will shoot me for saying this (because there's "high-level emulation"), but this is the basic idea, I don't want to go to more details, 'cuz I don't know a lot about that
Anyways, the error pops up because the game you are trying uses this operation/instruction that does not have a 'mapping' in ePSXe yet... which means you're out of luck. Try a different emu, or wait for the next version.
I *think* that's what it is, but I'm sure the emu authors and plugin authors will be able to give you more detailed (and accurate) answers, should you want more.