What should I do if my Visual Basic OPC application no longer compiles

With RSLinx Version 2.30.00 and later, the OPC Automation library was changed from RSLinxOPCAuto to RSIOPCAuto. If you have declared variables specifically to a given library such as RSLinxOPCAuto.OPCServer, a problem occurs. To correct this problem, change your data declarations to reference the new library (for example, RSIOPCAuto.OPCServer).