Sometimes you may get quite strange errors with simple solutions and silly reasons. Here is an example – you get a complaint that K2 ConnectionStringEditor.exe cannot be started with the following error message:

And that may really confuse you, especially when you are sure that it is clean, new and shiny, correctly performed installation 🙂 You start wondering what cofig is required and why on earth it had disappeared when there are seemingly no people tend to kill configs during the log clean up nearby. But what you need here before go into panic mode is second look at larger screenshot maybe… like this one:

So the error is actually caused by attempt to run the tool from search results instead of doing that by locating it in its default location (“C:\Program Files (x86)\K2 blackpearl\Host Server\Bin\ConnectionStringEditor.exe”).
Another quite typical error with this utility is attempt to run it without elevation on a server which has UAC enabled (I assume it should be any production Windows server, but you may see it disabled in some environments still).