Project missed?

“Failed to open map file. This is most likely because the map was saved with a newer version of the engine.”

Yesterday i saved project. Today i want to open and this message.

EDIT. I wanted to wrote on AnswerHub, but “There was an error contacting the remote service”.

I exported a map to my content and when i load it’s work fine. But when i save and restart UE4 this continues to be the error. Every time i must open a level. How i can fix this? I can set this level as first or deafault in this project?

UP. Wtf? I create a new project, save and still thisIn Unreal Editor i see no version for my project. What can i do?:confused: