Launcher crashing on open serialization error using blueprint level

This problem is occurring with multiple levels of students in a school setting.
Level starts to show in editor before crash.

In a school setting using Unreal Engine 4.12

before, the Unreal engine 4 crash reporter, there are a few messages…

An Unreal process has crashed: UE4-level01

Upon open, message box:

Serialization Error : Action Needed

“Corrupt data found, please verify your installation.”

Doing nothing, the system displays Initializing Asset Discovery with a progress bar (barbershop pole sideways in light and dark grey)

Project files showing as 1KB. for example: (Level01.uproject)

Hey gpinstructor,

“Corrupt data found, please verify your installation.”

This error message means that something has gone wrong with the engine installation, and you’ll need to either Verify your installation, which can be done by navigating to the Epic Games Launcher’s Library tab, clicking the arrow next to the engine version you’re using (4.12 in your case), and selecting the Verify option from the dropdown that appears. Or you can uninstall and reinstall the engine version as an alternative.

Let me know if you have further questions regarding this.

Have a great day