Please, need help with Paradox tables on Lantastic 6

  I have created one program with Delphi 1.
  The target system is one Lantastic 6 network, it's all
 configured but every 3-4 days the program don't run and get
 one error.

      I can't open detail table in AVISOS.DB

Where ist the cause of this error? How can I solve it?

Thanks for your help and sorry for my english.

    J Davi Evora H?nggi