Hi.
suddenly I get a message that says one of my level is a asset file?which I don’t know what it means.
and then after finish opening the project. The map is gone.it’s empty in the world outliner and the content browser doesn’t have the map either.
One time a similar thing happened to me. Try reverting all the changes or reverting to a previous version of your project, if you’re using version control. Though sometimes, even reverting doesn’t solve corruption issues (and sometimes it might not even be possible to revert) so I recommend always having a backup (preferably backups) of your project that’s not connected to any version controls.
Here’s a topic I found with a bunch of suggestions in it, check it out: Failed to load map! Umap appears to be an asset file
I really hope you’ll be able to overcome this issue! 
thank you,you’re very kind.
the solution in that thread doesn’t work for me either.other people there said the same.
the map doesn’t show in content drawer but it still in the folder in the drive.
I don’t have a version control.i think it’s out of my reach to fix it now.
I’ll back it up from now on 
.thank you reminding me
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