Aspen外接Fortran程序失败

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  *** SEVERE ERROR
      ERROR DURING DYNAMIC LINK OF USER ROUTINE(S) OR IN-LINE FORTRAN
      PLEASE CHECK FILE _2753vkv.ld FOR LINKER MESSAGES.

  *** SEVERE ERROR
      COULD NOT RESOLVE USER OR IN-LINE FORTRAN SUBROUTINE(S):

      SUBROUTINE "USERK" IS MISSING

  *** SEVERE ERROR
      PROGRAM TERMINATED DUE TO UNRESOLVED ROUTINES
请教高手们，万分感谢

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