I realise this is a really old post, but I had a similar problem the first time I played solo mode, because the regular tutorial doesn't explain how solo works with the range tokens. So this is in case others run into it as well.
The key is: You need to use all the range tokens, after which they repopulate. If you're in a situation where there are "no legal moves" then you probably have 1 or 2 range tokens left that won't ever land you on enclosure spaces. Just use them up, and you'll gain one of each again.
You start w/ 1 each of 0,1,2,3, & 4+ tokens. Once they have all been used, you get another set. When collecting animals you may have the option of using one or not; I find it's best to use one if it's the 3 or 4+, but to save the others for collecting enclosures, at least early in the game.
Hope this is helpful to anyone new to solo mode!