Error: unreal engine cannot open include file

What's Causing This Error

The "cannot open include file" error in Unreal Engine typically occurs when the compiler is unable to locate an included header file. Common causes of this issue include:

  • Incorrect Include Path: The specified path for the header file is wrong or the file has been moved.
  • Misspelled File Name: The name of the file in the #include directive does not match the actual file name, due to a typo or case sensitivity issue.
  • Missing File: The header file has been deleted or was not added to the project.
  • Project Configuration Issue: The project settings might not be configured correctly to include the directories where the headers are located.
  • Compiler Configuration: The build toolchain might not be set up properly, leading to an inability to find include files that are otherwise in the correct location.
  • Outdated Project Files: Sometimes generated project files (such as Visual Studio project/solution files) can become out of sync with the actual project.

Solution - Here's How To Resolve It

To resolve the "cannot open include file" error, you can try the following solutions:

  1. Check the File Path: Ensure the path specified in the #include directive is correct and that the header file exists at that path.
  2. Verify File Name and Case Sensitivity: Check for typos in the file name and verify the correct casing, especially if working across different operating systems which may handle case sensitivity differently.
  3. Regenerate Project Files: In the Unreal Engine Editor, go to 'File' > 'Generate Visual Studio project files' to regenerate the project files. This can help to realign any discrepancies between Unreal Engine and the IDE.
  4. Add Include Directories: Go into the project settings or build configuration and ensure that the directories containing the header files are included in the list of include paths.
  5. Check for Deletions: If the file might have been deleted, you may need to recover it or rewrite it if necessary.
  6. Rebuild the Project: Sometimes a full rebuild of the project can fix pathing issues, so try cleaning and rebuilding the project.
  7. Update Unreal Engine: If using an older version of Unreal Engine, consider updating to the latest version as there could be bug fixes related to project management and compilation.
  8. Consult Documentation: Look for documentation regarding the setup of third-party libraries or modules that you are trying to include, as they might require special setup steps.

If after attempting these steps the issue persists, more specific investigation into the project's configuration and the context of how the include directive is being used may be necessary.

Was this content helpful?

Start building today

Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.