Problem on _PUTIMAGE

windowDisplay& = _NEWIMAGE(800, 600, 32)
SCREEN windowDisplay&
DIM level%(64, 64)
DIM tiles&(127)

CHDIR "Platformer/Tiles"
tiles&(1) = _LOADIMAGE("grass.png")

FOR i% = 0 TO 10
    level%(i%, i%) = 1
NEXT

WHILE 1
    CLS
    PRINT "Test"
    FOR x% = 0 TO 63
        FOR y% = 0 TO 63
            _PUTIMAGE (x% * 32, y% * 32)-((x% * 32) + 32, (y% * 32) + 32), tiles&(level%(x%, y%))
        NEXT
    NEXT
    _DISPLAY
    _LIMIT 60
WEND