Error Message in Production Schedule

Hi all,

Please help me, I face Error Message when I try to open Production Schedule Feature in Navision 4.00 SP 1, by Click on Manefacturing in Navigation ban, then click on Planning – Production Schedule.Now I insert Image for this Error.

Error Showing Schedule data

Please If you have any information maybe useful, please provide me by My special Email address or only write your answer on this Message.

thanks for all,