You can start by emailing that information to the dev via the email in the screen.

it also happens to me on masterboy whenever i use savestates in the song screen (other screens are fine)

That happens to me a lot when switching from stock clock to a pitchbend clock or a half clock crystal whilst the software running. Do as it say's and 'Don't Panic!'

this just happens sometimes, just reboot the gameboy and try running LSDJ again and it'll probably work. magic!

if it happens all the time then email that info to johan kotlinski (a.k.a. the dude who makes LSDJ) via the address o the crash screen.

My Dmg pooped out on me and my screen came up with this

Dont Panic!
Rom: C              V4. 6. 9
4050                    STK: DFC5
c000          PLY: 0
0000          CVW: D
40e5
0000
4970
0100
9700        SYN: 0
3952        AST
f700

If Anyone has any idea how to fix this please help me out
Thanks