The following modules are missing or built with a different engine version

Development Programming & Scripting C++
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20

I can confirm UE 5.2 on Linux has some severe problems when adding a C++ class to the project.

My setup:

  • Linux Ubuntu 22.04
  • Unreal Engine 5.2 (built from source following official tutorial)
  • VSCode 1.81.1

I set up things following official documentation (toolchain, compiler, etc.). The engine starts and run without a glitch.

Then I do:

  1. create new project (named Test1) with C++ support
  2. open the project with VSCode
  3. start UE with the launch configuration “Launch Test1Editor (Development)”
  4. add a new C++ class (I derived it from GameInstance) using the command from the Tools menu
  5. update VSCode project config using the command from the Tools menu
  6. close the editor
  7. run the editor with the same command as above
  8. I get the error “modules are missing or built with different engine version”

I’m really stuck. At the moment the only solution I have is to rebuild everything with a “make clean” command. After that, it works again, until the next c++ class… (and this is not a solution, since it means rebuilding the whole engine, more than one hour on my machine)

UPDATE

I’ve found a viable workaround.
The problem seems focused on the Binaries/Linux/UnrealEditor.modules file inside the project. When I add a new c++ class, this file gets out of sync with the content of the Binaries/Linux folder, notably the line:

  "Modules": {
    "MyProject": "libUnrealEditor-MyProject-1234.so"
  }

The problem is: there is no libUnrealEditor-MyProject-1234.so, only libUnrealEditor-MyProject.so.
The workaround is to fix the library name inside this config file. Unreal loads correctly after this. HTH.

Is there anybody able to explain what’s going on here? :pray:

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