x86 - assembly lea: invalid effective address -

i'm getting kind of error:

beroset-p-637-invalid effective address

here's sample code block contains error line:

mov eax, 3 mov ebx, 0 lea ecx, [record + count*patient + firstname]          ;this 1 int 80h

here variables code block above:

patient equ 37 firstname equ 0  count resb 1 record resb patient*5

can't count variable used in multiplying patient?

i'm using nasm in x86 ubuntu 13

you can't multiply variable when computing address. have multiply count * patient separately , add in later.

Brazell