请教：导gerber时出现问题

                                                           )
(        ARTWORK LOG                                         )
(                                                            )
(        Drawing          : powerpc139.brd                   )
(        Software Version : 15.2p002                         )
(        Date/Time        : Tue Apr 25 14:25:13 2006         )
(                                                            )
(------------------------------------------------------------)

Tue Apr 25 14:25:13 2006    age     1

Photoplot log file
Results from parameter file ...

DEVICE-TYPE           GERBER_RS274X
OUTPUT-UNITS          INCHES
FILM-SIZE             2400000 1600000
FORMAT                5.5
ABORT-ON-ERROR        NO
SCALE                 1
SUPPRESS-LEAD-ZEROES  YES
SUPPRESS-TRAIL-ZEROES NO
SUPPRESS-EQUAL        YES
UNDEF-APT-CONT        NO

================================================================
     PROCESSING FILM < BOTTOM.art > ...
================================================================

  FILM PARAMETERS :
  ---------------------------------------------------------
  Undefined line width                5.00
  Mirror code                         NONE
  Rotate angle                        NONE
  Offset x:                           0.00
  Offset y:                           0.00
  Plot negative                       NO
  Suppress unconnected internal pads  NO

 WARNING: Film contains DRC error(s).

  APERTURES USED:
  ---------------------------------------------------------
  TYPE       SIZE/NAME                   ROT   MIRROR MODE
  ---------------------------------------------------------
  CIRCLE     0.01800                                  DARK
  CIRCLE     0.02000                                  DARK
  CIRCLE     0.02400                                  DARK
  CIRCLE     0.02500                                  DARK
  CIRCLE     0.02800                                  DARK
  CIRCLE     0.03000                                  DARK
  CIRCLE     0.03400                                  DARK
  CIRCLE     0.05000                                  DARK
  CIRCLE     0.05400                                  DARK
  CIRCLE     0.05700                                  DARK
  CIRCLE     0.05900                                  DARK
  CIRCLE     0.07087                                  DARK
  CIRCLE     0.07600                                  DARK
  CIRCLE     0.07700                                  DARK
  CIRCLE     0.07874                                  DARK
  CIRCLE     0.08200                                  DARK
  CIRCLE     0.11000                                  DARK
  CIRCLE     0.19685                                  DARK
  SQUARE     0.02000                     0.000 NO     DARK
  SQUARE     0.02953                     0.000 NO     DARK
  SQUARE     0.05000                     0.000 NO     DARK
  SQUARE     0.05400                     0.000 NO     DARK
  SQUARE     0.05700                     0.000 NO     DARK
  SQUARE     0.05900                     0.000 NO     DARK
  SQUARE     0.08200                     0.000 NO     DARK
  SQUARE     0.10000                     0.000 NO     DARK
  RECTANGLE  0.03000     x 0.02800       0.000 NO     DARK
  RECTANGLE  0.03000     x 0.02800      90.000 NO     DARK
  RECTANGLE  0.03500     x 0.01500       0.000 NO     DARK
  RECTANGLE  0.03500     x 0.01500      90.000 NO     DARK
  RECTANGLE  0.04000     x 0.05600       0.000 NO     DARK
  RECTANGLE  0.05000     x 0.03000       0.000 NO     DARK
  RECTANGLE  0.05000     x 0.03000      90.000 NO     DARK
  RECTANGLE  0.05000     x 0.04500      90.000 NO     DARK
  RECTANGLE  0.06000     x 0.04000       0.000 NO     DARK
  RECTANGLE  0.06000     x 0.04000      90.000 NO     DARK
  RECTANGLE  0.06000     x 0.05500       0.000 NO     DARK
  RECTANGLE  0.06000     x 0.05500      90.000 NO     DARK
  RECTANGLE  0.07000     x 0.01100       0.000 NO     DARK
  RECTANGLE  0.08000     x 0.01600       0.000 NO     DARK
  RECTANGLE  0.08000     x 0.02400       0.000 NO     DARK
  FLASH SYM  BLANK                       0.000 NO     DARK
  FLASH SYM  BLANK                      90.000 NO     DARK
  FLASH SYM  BLANK                     180.000 NO     DARK
  FLASH SYM  BLANK                     270.000 NO     DARK  (undefined)

 ERROR: aborting film - undefined aperture symbol - cannot continue

 Error in BOTTOM--halting output.  Artwork file not generated.
 *** ERROR with BOTTOM

------------------------------------------------------
 SUMMARY:
        *** ERROR with BOTTOM

 ARTWORK Error

哪位高手知道怎么解决，请指教！

檢查那個undefined Flash

可能是零件庫沒有建那個Flash

我怎么知道是哪个库的没有FLash?怎么查，请指教。