Here's one reason. In MAS 200, at the workstation, look at the local SOTA.INI in the [Servers] section at the PATH= clause. Let's say that path is M:\Apps\Mas90. The Launcher will start just fine but when you access certain tasks you will get that error the reason being that M: is valid from workstation but not from server. IOW, the account being used to run your App Server as a service or application, it must have the same exact M: drive mapping or the SOTA.INI must be corrected to use a UNC. Now even if it's a UNC not a mapped drive, that UNC must be valid from both workstation and server. Hope that made sense.