Message "loading resource pack" stuck and occurs into an error

When I try to enter in my Minecraft world, it says "Loading resource pack" with the tips underneath as always but usually the message disappear after some seconds and it starts to load the world but this time it won't go away until a full screen message "There was a problem loading this world" appears. I tried to shut down the device and turning back on multiple times but it doesn't work. Please help me because that world was important.