Failed to find the world in already loaded world package /Game/FirstPersonBP/Maps/FirstPersonExampleMap!

After 4.27 update i get this message: Failed to find the world in already loaded world package /Game/FirstPersonBP/Maps/FirstPersonExampleMap!
After this when i open project my level is complete empty but assets is still there.
Does this mean i don’t save properly something on previous version and should start all over again?
I tried to open copy of the project first but had same issue

Do you have a Umap file of the map?