I’m new to Unreal Engine and recently downloaded Unreal Engine 5. I created a new project using the Third-Person template, but when I try to launch the project (or open it again after closing), I get the following error:
“Failed to open descriptor file ‘…/MyProject/MyProject.uproject’”
I’ve double-checked that the .uproject file exists in the folder, and I haven’t moved or renamed anything manually. I’m running this on Windows 10 and using the Epic Games Launcher.
Here’s what I’ve tried so far:
Verified engine files through the Epic Games Launcher
Deleted Intermediate and Saved folders and rebuilt
Ran the .uproject file directly from File Explorer
Opened the project with “Run as Administrator”
None of these steps worked. Has anyone encountered this issue before? Any help would be greatly appreciated!
Welcome to UE! That error usually pops up when the engine is unable to properly find or read your uproject file. There are a few ways to resolve this issue:
Your project path looks to be a bit long, please test moving it to something shorter, like "C:\UE5Projects\MyProject", then launch it from there. Also, make sure the extension remains as .uproject, and not anything else
Next, you can right-click the uproject file, and choose “Switch Unreal Engine version”, then re-associate it with your current UE install. This will rebuild the link to your project
If the problem persists, you can force a clear cache, via deleting folders “Binaries” and “Intermediate” from your main directory, then right-click the uproject file again, this time choosing “Generate Visual Studio project files”, then try to open it in engine
Finally, you can also open the uproject file with Notepad, and make sure the “EngineAssociation” line matches your installed version
