compiler error (*solved*)

[slenkar]

im using the latest beta build

here is my source:

Code:

BORDER 7 : PAPER 7 : INK 0 : CLS
  PRINT AT 3,13 ; PAPER 1 ; INK 7 ; "BattleField"
  PRINT AT 5,9 ; PAPER 7 ; INK 0 ; "Q - Up"
  PRINT AT 6,9 ; PAPER 7 ; INK 0 ; "A - Down"
  PRINT AT 7,9 ; PAPER 7 ; INK 0 ; "O - Left"
  PRINT AT 8,9 ; PAPER 7 ; INK 0 ; "P - Right"
  PRINT AT 9,9 ; PAPER 7 ; INK 0 ; "M - Select"

  PRINT AT 10,3 ; PAPER 7 ; INK 0 ; "You have to select units"
  PRINT AT 11,3 ; PAPER 7 ; INK 0 ; "to fight the enemy units"
  PRINT AT 15,3 ; PAPER 7 ; INK 0 ; "Press any key to start"

60  LET j$ = INKEY$
  IF j$ = "" THEN GOTO 60: END IF

cls
Dim BlueFactoryX (6) as uByte
Dim BlueFactoryY (6) as uByte

for x =1 to 6
BlueFactoryX(x)  = byterndrange(1,30)
BlueFactoryY(x)  = byterndrange(1,30)
next

drawFactories()

function drawFactories()
for x =1 to 6
print at BlueFactoryX(x), BlueFactoryY(x); "O"
next
end function

Function byterndrange (first As uByte, last As uByte) As uByte
    return Rnd * (last - first) + first
End Function

here is the error message when I compile:

Traceback (most recent call last):
File "zxb.py", line 309, in <module>
File "zxb.py", line 242, in main
File "zxbtrad.pyc", line 316, in traverse
File "zxbtrad.pyc", line 1202, in traverse
File "zxbtrad.pyc", line 217, in emmit_let_left_part
TypeError: bad operand type for unary -: 'NoneType'

also it seems that underscores are not allowed in function names, is this right?