请教：Allegro出光绘时的问题

Allegro出光绘时，遇到了以下错误报告：
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( ARTWORK LOG )
( )
( Drawing : 090327_a.brd )
( Software Version : 15.7p007 )
( Date/Time : Fri Apr 03 14:40:56 2009 )
( )
(------------------------------------------------------------)

---- Photoplot outline rectangle not found ... using drawing extents


Can't open parameter file ... using default values:
DEVICE-TYPE GERBER6X00
G-CODES NO
STATIONS-PER-WHEEL 24
FILM-SIZE 24000 16000
COORDINATES ABSOLUTE
OUTPUT-UNITS INCHES
FORMAT 5.3
ABORT-ON-ERROR abort film & continue
SUPPRESS-LEAD-ZEROES YES
SUPPRESS-TRAIL-ZEROES NO
OPTIMIZE YES
SUPPRESS-EQUAL YES
SCALE 1.0

WARNING: database resolution exceeds the resolution of the
output coordinates (see FORMAT in parameter file).
Some roundoff of coordinates may occur unless the number
of decimal places in the output file is increased.

ARTWORK Error reading apertures.
请教高手，帮忙予以解答。谢谢！