Only the engine textures (third option in your Tool) kept popping up. Perhaps Save All didn’t work (sometimes it doesn’t save everything, especially when I delete stuff).
I did rebuild all the Levels, checked again, and those engine textures got saved again… but I just went ahead, and it didn’t give me any error while compiling.
That works for me, in my case was the Started Content materials.
Plugin is now available for free on the Unreal Marketplace!
Now you no longer have to worry about figuring out how to add the files to your project or deal with compiling it yourself.
Go to the above link, acquire it, and install it to the engine. Open the relevant project, open the plugins window, under “Window” in the top toolbar, search for “GUID Fixer” and check the box to enable it. Restart your editor and you should see the new options under “Tools” in the toolbar!
This is using the latest version of the plugin. If the issue persists after using both texture fix buttons and saving all, please let me know!
If anyone wants to make a better icon for it, feel free lol.
2 Likes
Thank you so much davisctools !!! A true hero 
Duuuuude you saved my life!! Worked on UE 5 on Windows 11!!! Thanks!!!
You’re an abosolute legend!
Since i only have programming experience in Blueprints
I was pulling my hair out of hours trying to figure out what went wrong
It solved everything
GREAT!
Sorry, I’m new here, what do you mean by running this code somewhere in the editor? How can I run the code?
How did you go with this? Im having the same dilema
After being repaired with the GUID plug-in, this error still appears during packaging
Assertion failed: StreamingTextures.Num() == StreamingTextureGuids.Num() [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\Level.cpp] [Line: 1912]
0x00007fff134b45b8 UnrealEditor-Engine.dll!UnknownFunction []
0x00007fff13023e82 UnrealEditor-Engine.dll!UnknownFunction []
0x00007fff143e19b3 UnrealEditor-Engine.dll!UnknownFunction []
0x00007fff134ac536 UnrealEditor-Engine.dll!UnknownFunction []
0x00007fff6b0aee45 UnrealEditor-CoreUObject.dll!UnknownFunction []
0x00007fff6b0c9ecb UnrealEditor-CoreUObject.dll!UnknownFunction []
0x00007fff6b0ca434 UnrealEditor-CoreUObject.dll!UnknownFunction []
0x00007fff6b0ca7af UnrealEditor-CoreUObject.dll!UnknownFunction []
0x00007fff67c89396 UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007fff67ac0355 UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007fff67aab3bd UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007fff67acf4e0 UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007fff678db1bd UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007fff678fcb5c UnrealEditor-UnrealEd.dll!UnknownFunction []
0x00007ff6ef4c948e UnrealEditor-Cmd.exe!UnknownFunction []
0x00007ff6ef4c0bbd UnrealEditor-Cmd.exe!UnknownFunction []
0x00007ff6ef4c0e8a UnrealEditor-Cmd.exe!UnknownFunction []
0x00007ff6ef4c3c4d UnrealEditor-Cmd.exe!UnknownFunction []
0x00007ff6ef4d5564 UnrealEditor-Cmd.exe!UnknownFunction []
0x00007ff6ef4d788a UnrealEditor-Cmd.exe!UnknownFunction []
0x00007fff9edd7614 KERNEL32.DLL!UnknownFunction []
0x00007fffa0ca26a1 ntdll.dll!UnknownFunction []
Did you save after fixing GUID ?
You are my hero, this fixed my issue. Thank you so much!
This worked perfectly. Thank you for the information and link friend!
In my case, it was due to (ChilldActor). The error was not in the blueprint itself (#1) which crashed during compilation.
And in another blueprint (#2), which had (ChilldActor - (#1)). I just removed (Component ChildActor) and created a new one with a different name.
Thank you.
Now please fix all of the other bugs! 
Thanks for this Plugin, you save my life 