Forum:Incompattable world file?

I'm hoping someone can help me out with an issue im having loading up the world where i have my house and all of the items ive found thus far stored in it.

Everytime i load up the world it says "Incompattable world file" And nothing seems to load up. If anyone has ever had this problem before and found a solution please let me know right away so i can get back to playing this awesome game, Much thanks!