This is my project but I don't know how to fix this error

Development Programming & Scripting Blueprint
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1

UATHelper: Packaging (Windows (64-bit)): LogInit: Display: CookResults: Error: Error loading D:/Project/Theway/Content/ThirdPersonBP/FirstTerrain_Mat.uasset!
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogCook: Error: Error loading D:/Project/Theway/Content/ThirdPersonBP/FirstTerrain_Mat.uasset!
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: CookResults: Error: Error loading D:/Project/Theway/Content/Level1_BuiltData.uasset!
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogCook: Error: Error loading D:/Project/Theway/Content/Level1_BuiltData.uasset!

2

The error message isn’t very descriptive so it’s hard to tell what’s going on.
Do the files that are mentioned exist?

3

I cannot load this arrest