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when TMDSEVM572X output Gerber , the errors happen

Other Parts Discussed in Thread: TMDSEVM572X
Software:Allegro 16.6
TMDSEVM572X 's design files are download from TI web , but when the file TI_AM572x_PM_A3a.brd output Gerber , error happens , the informations are below
 
ERROR: aborting film - Undefined aperture symbol, cannot continue.
           See APERTURES USED table in this file for symbols to provide.
Error in TI_AM572x_PM_RevA3_L1--halting output.  Artwork file not generated.
*** ERROR with TI_AM572x_PM_RevA3_L1
 
ERROR: aborting film - Undefined aperture symbol, cannot continue.
           See APERTURES USED table in this file for symbols to provide.
Error in TI_AM572x_PM_RevA3_L12--halting output.  Artwork file not generated.
*** ERROR with TI_AM572x_PM_RevA3_L12
 
 
SUMMARY:
        TI_AM572x_PM_RevA3_fab created with warnings
        TI_AM572x_PM_RevA3_sps created.
        TI_AM572x_PM_RevA3_spc created.
        TI_AM572x_PM_RevA3_sms created.
        TI_AM572x_PM_RevA3_smc created.
        TI_AM572x_PM_RevA3_bslk created.
        TI_AM572x_PM_RevA3_tslk created with warnings
        TI_AM572x_PM_RevA3_L8 created with warnings
        TI_AM572x_PM_RevA3_L11 created.
        TI_AM572x_PM_RevA3_L2 created.
    *** ERROR with TI_AM572x_PM_RevA3_L1
    *** ERROR with TI_AM572x_PM_RevA3_L12
        TI_AM572x_PM_RevA3_L3 created with warnings
        TI_AM572x_PM_RevA3_L6 created with warnings
        TI_AM572x_PM_RevA3_L7 created with warnings
        TI_AM572x_PM_RevA3_L4 created.
        TI_AM572x_PM_RevA3_L5 created with warnings
        TI_AM572x_PM_RevA3_L9 created with warnings
        TI_AM572x_PM_RevA3_L10 created with warnings
        TI_AM572x_PM_RevA3_BACKDRILL_12-4 created.
    *** ERROR with TI_AM572x_PM_RevA3_ASSEMBLY_TOP

*** ERROR with TI_AM572x_PM_RevA3_ASSEMBLY_BOTTOM
详情:Allegro 16.6,用TI官网下载的TMDSEVM572XTI_AM572x_PM_A3a.brdGerber文件时出错,信息如下:
 
ERROR: aborting film - Undefined aperture symbol, cannot continue.
           See APERTURES USED table in this file for symbols to provide.
Error in TI_AM572x_PM_RevA3_L1--halting output.  Artwork file not generated.
*** ERROR with TI_AM572x_PM_RevA3_L1
 
ERROR: aborting film - Undefined aperture symbol, cannot continue.
           See APERTURES USED table in this file for symbols to provide.
Error in TI_AM572x_PM_RevA3_L12--halting output.  Artwork file not generated.
*** ERROR with TI_AM572x_PM_RevA3_L12
 
 
SUMMARY:
        TI_AM572x_PM_RevA3_fab created with warnings
        TI_AM572x_PM_RevA3_sps created.
        TI_AM572x_PM_RevA3_spc created.
        TI_AM572x_PM_RevA3_sms created.
        TI_AM572x_PM_RevA3_smc created.
        TI_AM572x_PM_RevA3_bslk created.
        TI_AM572x_PM_RevA3_tslk created with warnings
        TI_AM572x_PM_RevA3_L8 created with warnings
        TI_AM572x_PM_RevA3_L11 created.
        TI_AM572x_PM_RevA3_L2 created.
    *** ERROR with TI_AM572x_PM_RevA3_L1
    *** ERROR with TI_AM572x_PM_RevA3_L12
        TI_AM572x_PM_RevA3_L3 created with warnings
        TI_AM572x_PM_RevA3_L6 created with warnings
        TI_AM572x_PM_RevA3_L7 created with warnings
        TI_AM572x_PM_RevA3_L4 created.
        TI_AM572x_PM_RevA3_L5 created with warnings
        TI_AM572x_PM_RevA3_L9 created with warnings
        TI_AM572x_PM_RevA3_L10 created with warnings
        TI_AM572x_PM_RevA3_BACKDRILL_12-4 created.
    *** ERROR with TI_AM572x_PM_RevA3_ASSEMBLY_TOP
*** ERROR with TI_AM572x_PM_RevA3_ASSEMBLY_BOTTOM