Why can't I use a macro inside the procedure?

I can't compile the program. The compiler writes: illegal instruction. Why can't I use a macro inside the procedure? And how to fix it?

Code:

format PE GUI 4.0
entry START
include 'win32ax.inc'
include 'ConvertByteToANSIBinaryNumber.inc'

START:
        stdcall ConvertByteToANSIBinaryNumber, 10, _buf
        invoke MessageBox, 0, _buf, Caption, MB_ICONINFORMATION+MB_OK
        invoke ExitProcess, 0

Caption db 'Test programme.',0

_buf: db '        '
_buf_len = $ - _buf

data import

  library KERNEL32, 'KERNEL32.DLL',\
          USER32, 'USER32.DLL'

  import KERNEL32,\
  ExitProcess, 'ExitProcess'

  import USER32,\
  MessageBox, 'MessageBoxA'

end data

Code:

;[byte]  byten - byte, that we need to convert.
;[dword] buffer  - buffer address, that will be record our result.

proc ConvertByteToANSIBinaryNumber,byten:BYTE, buffer:DWORD
        _ConvertByteToANSIBinaryNumber   [byten], [buffer]
        ret
endp 

macro _ConvertByteToANSIBinaryNumber   byten, buffer
{
local cnv, set1, cont

        mov      al, byten
        mov     edi, buffer
        xor     ecx, ecx
        mov     cl, 8
cnv:
        rol     al, 1
        jc      set1
        mov     [edi], byte "0"
        jmp     cont
set1:
        mov     [edi], byte "1"
cont:
        inc     edi
        dec     cl
        jnz     cnv
}

macro _ConvertByteToANSIBinaryNumber byten, buffer { ... } ;define it first proc ConvertByteToANSIBinaryNumber,byten:BYTE, buffer:DWORD _ConvertByteToANSIBinaryNumber [byten], [buffer] ;then instantiate it ret endp