it’s solved my problem!!! I love u!
thanks，it’s solved the problem. add shortcut on desktop and input -ddc=NoZenLocalFallback help me open the UE5.5.
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Win + R search for regedit. Search Computer\HKEY_CURRENT_USER\Software\Epic Games folder and remove DeriveredDataCache registry folder. Worked for me
Hello! I had the same issue. Solution was written in the error:
Add -DDC-ForceMemoryCache to the command line to bypass this if you need access to the editor settings to fix the cache configuration.
In my case I opened cd and entered
cd “C:\Program Files\Epic Games\UE_5.5\Engine\Binaries\Win64”
and after that UnrealEditor.exe -DDC-ForceMemoryCache
Edit the version and path. After the initial launch you can edit preferenecse for cache storage.
After that I have change Local and Global DDC path from Drive C (which is system disk) to D drive (I have created custom folder in D drive for local and another one for global, granted permissions to all). When path was to C drive the error was still there. Probably because of some internal drive restrictions (even though permissions were granted to all users for C drive). Now it works.
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Turn off VPN , of any kind (in-browser e.t.c.) and try again
works for me
Sicne a lot of people use it nowadays they forget to turn it off
This is probably ue5.4 zen server connection problem
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yes, it works for me. thank you!
For the problem I encountered, deleting the AppSata/Local/UnrealEngine/Common/Zen directory and the AppSata/Local/UnrealEngine/Common/DerivedDataCache can solve this problem. This will result in the regeneration of DDC.
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This is an old issue, but I’m sharing my solution in case anyone else has been struggling like I did.
The cause was that the DDC path I couldn’t access was written in the [InstalledDerivedDataBackendGraph] entry in DefaultEngine.ini. So I just deleted [InstalledDerivedDataBackendGraph] from the ini file, and I was able to run the project without crashing!
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That’s helped! Thanks! 
active vpn cause this error! life saver dude!
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- Turning off VPN does NOT work for me.
- Modifying the DefaultEngine.ini is not working for me.
- Deleting the DerivedDataCache in both the Engine folder and %localappdata%\UnrealEngine\5.5 does not work for me.
The -DDC-ForceMemoryCache option is the only thing that works. This should be fixed by Unreal, I can imagine this immediately halting new developers trying to get into the engine.
I had this exact same problem, I turned off my VPN and the problem went away… that’s all i know
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If you are an indie developer (single developer working with one instance of Unreal Editor), I probably have a solution for you here.
This will disable Zen Cache and reverts back to old caching style which is creating a compressed cache file (Compressed.ddp) in Engine or Game folder.
Cons:
- It probably make builds slower
- Crash once in a while due to corruption of cache which require deleting the ddp file and waiting a few minutes for cache to build up again
Pros:
- Editor will not randomly crash due to suddenly not being able to communicate with zen cache server for no obvious reason.
- Your OS drive (drive C) will not suddenly be full due to zen cache taking entire space to cache things that you don’t even need (it even caches stuff from that one project, you’ve created to test something and deleted a few minutes later).
- Now your cache is in your project drive that probably has terabytes of space that you don’t have in your OS drive (drive C)
Zen is a great way of caching and on paper it works well, but its implementation as it is now with no obvious or documented way to configure, makes it impossible to use. I hope Engine developers find some free time to address this issue.
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Have the problem from time to time, and it is the VPN for me. All the time. had to turn it of for the engine start, after that i can activate it again.
Turning the VPN off fixed it for me. Thanks
You’re a life saver.