Hi.
That’s a new error.
Try the following step.
- Close unreal and visual studio;
 - Go to your project folder;
 - Delete the following selected folders and files:
 - Right Click on your 
.uprojectand generate your visual studio project file:
 - Open your project’s solution (
YourProject.sln); - On visual studio press 
CTRL + F5. 
In case it does not work, can you print your UpgradeLog.htm.
Bye.

