production schedule not open why

When i open production scheduale in dynamic nav 2009 i see this message error “missing c/al programmeres could not create instance of ole control or automation server identifiy by guide[xxxx] unknown automation server unknown class check for automative server correctly installed and registered” why this message show how i solve this proplem

Codeunit 5500 two automation variable defined which is not getting instantiated.

this message found in this link

thanks for help