It’s a project with things in it, the version is 5.1.1. This issue just suddenly happens, before that things in this project were fine.
I tried to create a new level, and the Open Level is working fine, the newly created level could be opened. However, still not very sure what causes the Open Level can’t open that particular level, there is no crash before that.
But I think currently has no big issue with it since it still could be opened through the content browser. The level file might be somehow corrupted I believe.