Worlds are not loading ingame

Part of bug report MCPE-62806

 

 I did not know about this bug at the time of posting my bug report about the resource packs. But my Minecraft worlds also are not loading when i launch the game. I have no idea why this is happening, but i noticed the error when trying to look at a resource pack in one of the worlds i have. but this completely makes my Minecraft Windows 10 Edition unusable to my previous worlds. I tried Reinstalling the game, however it made no difference.