Every time I put experimental functions on a world created or to be created, it crashes.

I cannot enter any of my previous worlds and it does not let me create worlds with addons, not even one, every time I create a world, I activate the experimental functions by entering and addon, I create the wordl and he crashes. I uninstalled it and I reinstalled it and put addons back on it but again it crashed, what happens is that it loads the world and then before entering the world it gives a screenshot and it Close, and what I would like to see happen is that you let me play calmly with miss addons