Not enough space?

Not enough space?
I can't access to my world because continuously is telling me: You don't have enough space to save Minecraft progress but I have 16 gb of free space in my legit SD Card and 2 gb of free space in my internal memory and my world just have a size of 100 mb with the resource packs and 75 mb without them. Please help me is very frustrating, I played in that world hundreds of hours literally, I can't found any answers or solutions.
My phone is a Go Mobile 504.
PD. This only happens when I am moving far away from my spawn and continuously happens when my world reach the size of 100 mb.
Sorry for my bad English.
I love your work but please like a recommendation a good optimization of the world is better than more content.