So, I’ve been working in UE 4.27 and 4.26, but I have also older versions installed.
Been all working great for years. Today morning opened the projects, everything worked.
Didn’t restart PC, left it idling for an hour.
Came back, tried to launch 4.27 project - got an error:
When I launch the engine from the Launcher, and then browse to the projet, all works great.
Now, I cannot generate project files either. It worked last week. I didn’t update windows, did nothing.
The error was first due to UnrealBuildTool being in wrong folder, ChatGPT helped me with that, so I built that and now I get an error when trying to Generate Project Files:
UnrealBuildTool.Main: ERROR: Unhandled exception: System.IO.DirectoryNotFoundException: Nie można odnaleźć części ścieżki „D:\Epic Games\UE_4.27\Engine\Engine\Source”.
UnrealBuildTool.Main: w System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
UnrealBuildTool.Main: w System.IO.Directory.SetCurrentDirectory(String path)
UnrealBuildTool.Main: w UnrealBuildTool.UnrealBuildTool.Main(String ArgumentsArray)
UnrealBuildTool.Main: DirectoryNotFoundException: Nie można odnaleźć części ścieżki „D:\Epic Games\UE_4.27\Engine\Engine\Source”.
UnrealBuildTool.Main: w System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
UnrealBuildTool.Main: w System.IO.Directory.SetCurrentDirectory(String path)
UnrealBuildTool.Main: w UnrealBuildTool.UnrealBuildTool.Main(String ArgumentsArray)
It doubles the “Engine” folder for some reason.
I tried reinstalling Unreal Engine 4.27, didn’t help.
Unreal Engine 5, both 5.5 and 5.6 works great.
What happened? How do I fix this? What the hell is going on? I did nothing wrong…
Same thing here. One of our team members reported this issue yesterday on his project. I don’t know if its related but I coincidentally noticed an epic game launcher update sometime that same day, it continued to work fine for me that day, but upon restarting my machine this morning, None of my project files will open directly either without giving the same Error.
I’ve already tried verifying the installation. My next thought is to re-install unreal, the launcher or both, but I’d like to avoid that headache if I can.
You aren’t the only one having this issue. I’m aware of at least 3? Individuals that also have this issue starting yesterday.
I unfortunately don’t have a solution for you, but that said, I’ll keep tabs on this thread in case you or them happen to find a solution. If they should happen to find one, I’ll be sure to reply
Now for the bad:
I believe the individuals in question have been looking into this fairly heavily and have yet to find any leads. That doesn’t mean all hope is lost, but I am surprised there’s nothing yet as they’re fairly competent users…
Seeing as it’s a non-isolated issue and it all happened at the same time time, I’d unfortunately have to think it may be related to Epic games somehow and that this is out of our hands…
Same here. I have both UE4 and UE5 installed, but my primary IDE is UE4, and all of the sudden all UE4 projects cannot be launched and this error message pops up!
Not a fix, but a workaround that seems to have got things working again was re-installing the epic game launcher. Initially I used the most recent installer EpicInstaller-19.0.0 but that one was unable to download any plugins (kept stalling at 0% with unknown error) so I used an older installer we still had ‘EpicInstaller-14.6.2‘
After it was done installing and updating it shows as 1.3.67.0
When I first opened it, it did tell me there was a newer version and asked me to update, but this time I said no. I was able to re-install ue4.27.2 download and install the plugins I needed and open projects directly again.
My guess is something in the updated version is broken as far as unreal 4 projects and hopefully they’ll resolve it soon.
