Generally, this error means your current PI SMT version is too old. You could download the PI SMT 2010 or later. If still having problem, you could contact OSIsoft Techsupport team, as they are the expert to solve this kind of problem.
My version is 1.4.0
it was running fine. but it stopped running after i installed MatrikonOPC and PI_OPC client
Please try a repair of PI SMT.