Basically, you need to keep at least one infantry or cavalry in a territory when you are fortifying. If you try to foritfy all the infantry and cavalry out, leaving only navy / siege / forts, then it will generate this error. Is this what occurred? If you left any infantry or cavalry behind, then this is a bug report
No I did try to move my entire available army but it dident allow me to move any, I'll take the next turm and experiment with it and get back to you.
Okay. When you try to move but it disallows the move (via a popup), then you shouldn't lose any movement points. It's basically the game engine saying "Hey wait a minute, I'm cancelling that action because it's not a legal move". If you lost your movement point, then again, that's a bug. Here's the deal:
If you try to move all sentient troops, the engine should throw an error (a popup screen)
No movement points should be used
No troops should move
If something other than that happens, then it's a bug in the program, which I'll fix right away. From what you've described, it's difficult to determine whether it's a problem in the program, or if it's just a misunderstanding of the rules (which really is my fault because I have to write better instructions)