Unable to connect to world. Please check your connect to the internet and try again. Can't play My OWN MCPE map offline

Hello Mojang

 This is a serious and weird issue. When ever I join my OWN Minecraft map it says "unable to connect to world. Please check your connection to the internet and try again". This is a weird thing to happen and it has never happened to me before. I've noticed this error immediately after updating to 1.16.100 . I've worked on this map for 1 month almost 2 and to have something like this to happen to me is very scary. I love Minecraft a lot and really don't wanna loose my world. Please look into this is or let me know if anything can be done to fix this because no matter what I do, I can't join it because it gives me the same problem even if I'm connected to internet or not.