Tries to Load, Then Freezes

I log into my world. When everything starts to load, the game freezes suddenly. I can't interact with anything, and I have to completely close the game. I have tried restarting the game, hard shut downs, etc. Once, I was able to copy my world and get it to work, but the problem has continued to happen and copying the world does not work. I get the error message, "Global resources failed to load previously."