Unable to add add-ons and wont replace my world

Realm wont replace my world after a very long time exporting the world at the end it will keep sending error occured and also problem when i add add-ons somtimes after the message "applying packs" after that whem u check the resourcepack and behviorpack is not plugin i wont plug in, what happens to ur realm end showing a lot of erros from replaceworld,resetword,backupreplaceworld, and addons plug in ,somering wrong with ur realm when i first purchase it its all function still working after 2months a lot of error showing everytime in replaceword