This has already happened twice. Could it be because the file had more than 500 rows (that was the default value when imported)?
Is there any way to “backup” the project and restore it after such an “internal error”?
My nocoDB is hosted on fly.io.
I would be very grateful for any help.
Can you tell us more about this error?
This should not be happening due to the number of rows.
Did you delete your docker container by any chance ? And if so you had done it without setting NC_DB or mounting volume for default SQLite database - you will lose your data.
Please refer to our installation & environment docs.
I don’t know what else I could add. I was using mysql database. I just ran the tests again, imported the csv file 3 times, and of course there was no error to show this time 
After the “internal error” message I’ve refreshed the window, had to log in to the application again. After logging in, the app looked like a fresh install. There was no project and the only database was sqlite.
I didn’t change the default environment variables settings, so I’m guessing I made a mistake here. To be honest, I’m not sure how to do it properly.