Hi all,
Just started using learning UE5.4 a couple of weeks ago and decided to install 5.5 but I’ve been receiving this crash issue around 9% every time I try and launch.
“[File:D:\build++UE5\Sync\Engine\Source\Developer\DerivedDataCache\Private\DerivedDataBackends.cpp
Unable to use default cache graph ‘InstalledDerivedDataBackendGraph’ because there are no writable nodes available.Add -DDC-ForceMemoryCache to the command line to bypass this if you need access to the editor settings to fix the cache configuration.”
This issue happens when UE cant access to the DDC (Derived Data Cache). I found some ways you can solve this
1. Try running the engine as administrator.
2. Update your Graphics Drivers
3. Use -DDC-ForceMemoryCache Flag
Right click on the shorcut, go to properties, in the Target field, add -DDC-ForceMemoryCache at the end of the command like so: "C:\Program Files\Epic Games\UE_5.5\Engine\Binaries\Win64\UE5Editor.exe" -DDC-ForceMemoryCache
This will try to bypass DDC and let you use the editor to check cache configuration.
4. Clear DDC
You probably have currupted DDC files, so if you delete the entire DDC folder UE will rebuild it when you launch again the editor.
Should be located here: C:\Users\<YourUsername>\AppData\Local\UnrealEngine\Common\DerivedDataCache
5. Check Disk Space
Make sure that your disk space is not full so that UE can write those cache files.
Also Double check if you have writing permissions on the DDC folder
Try going one by one and let me know if any of these works!