I have been frequently getting this error message on Minecraft Bedrock Windows 10:
You are out of data storage space and Minecraft is unable to save your progress! Minecraft will return you to the Main Menu to clear up storage space.
I first noticed it while playing a downloaded Realm that I've played on this computer before, but this time when I started it only went a few seconds before crashing to that message.
However it's gotten worse. I had deleted all packs and worlds, reinstalled the game, started a couple of new worlds and it happens again! I've got less than 100 MB of save data at all, with hundreds of GB open!
Even weirder, it doesn't fully return to the Main Menu. If I click Settings, it brings up the settings menu from while playing the world that just crashed instead. Also if I try to load any save file in that state, the program fully crashes and closes.
This has made playing Minecraft very difficult, since at any moment it may just kick me out and then that world is unplayable for good.
The only way around it I've found where I can consistently play, so far, is if I join someone else's world, which isn't what I'm wanting to do.
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It started for me in 1.13. See MCPE-54748 too.

try staying close to your start point... range is around 500 blocks before error occurs and stay out of nether. its an issue with your world file size ballooning to much when you play that started with the 1.13 update. you said your in 1.12 but the error never occurred for me in previous versions.

Many communities are experiencing this same issue. The host will see an error indicating it is our of space, and players will see an error saying the world is corrupt.
The community seems to be in agreement that it is related to loading new chunks, which is why it happens most often while traveling long distances, like with a boat.
There is already a bug report higher up in the priority list(90 Votes+). You can help draw some attention to our problem by voting for it & adding any additional details you may have. Hopefully by consolidating and raising awareness of the one issue we all will receive a faster resolution.
https://bugs.mojang.com/browse/MCPE-32501

Thank you for your report!
However, this issue is a Duplicate of MCPE-32501.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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