I get error at any slightest change I want to make in my realm.

A while ago, I added a simple texture pack to my Minecraft PE realm and from that moment anything I want to do, whether it's removing some add-on, texture pack or turning it off, I get an error

 

 

As it happens when I want to replace the world, I do not abandon myself, I have been trying to solve it, but I do not find a way to do it, I would like to help me solve it, since I need to replace the world.

 

Thank you for your attention

 

Sincerely user "Caliente9000"