All .fhz files no longer work with the new patch, and Chocolate Land is a map that uses an .fhz file.
Now as for the "exports" folder, are you sure you installed the patch correctly? If you got FeralHeart when it first came out, and downloaded "Feral Heart Patch" Then it won't work. You need to save any maps you made, save any presets you've made, (by moving their files to somewhere else) uninstall FH, download the "Feral Heart Game Setup", and install that. But never put any .fhz files back, or it'll crash the game, you'll just have to wait until the creator re-exports them for the new game version.
Hopefully it'll work now. ^^