Map Closes Randomly

[mystic temple]

When I'm building a map and playing it in everest, it will randomly close and give a postcard message saying it can't be opened again. This goes away if I simply reopen Celeste. I can't tell what causes it

This is the log

[summer spear]

this log file from 11/15?

[summer spear]

I'm not sure if this is a correct log because it doesn't contain error about postcard or map

[mystic temple]

Where will the correct log be?

[cinder solar]

There are two types of logs; crash logs and log.txt.

Crash logs are generated when you see an "Oooops! :(" crash handler screen. They contain extra information which regular logs don't.
To access those, there's a button that says Open log file folder, which should take you to where they're stored. Make sure to grab the latest one!

For more subtle issues, non-crashing problems or other miscellaneous stuff, log.txt is checked. To find it, do the following:

• Open Olympus.
• Press the Manage button in the Installations panel on Olympus' main menu. (it's to the left)
• Press Browse to open the Celeste folder.
• Look for the file named exactly log.txt inside that folder. Do not grab error_log.txt or look into the LogHistory folder as those are not the log.txt you're looking for.

Your username may sometimes show up in those logs. If you're concerned about that, remember to censor it before uploading. Every text editor should have a replace function, commonly opened with Ctrl+H.

[mystic temple]

I'm pretty sure it's the same log.txt