Autosaving project opreation failed

I use a laptop with RTX2070super. I try several times to align the images.But when the operation started a few minutes, pop up a window of autosaving project operation failed. after that, I reinstall the software. and problem is still there and I download some old versions that can be cracked. and that the software can be normal to operate the 3d model. so what should i do to solve this problem?

Hi 卡批燃, are you using non-latin characters in your Epic Games account? This could be a reason why is this happening.

I just saw the detail of my ID. But I don’t know how to change a user name. I saw I only can change nick name and name in account details. how to solve this problem? 

You need to change the Epic Games account name: 

| 卡批燃 (sccdhjz@gmail.com)  159313f579cd459f8200f3a47718311c |

To do so, you need to do it on Epic Games site.