vscode fatal error ui_demoh No such file or directory

This error message indicates that the file "ui_demo.h" could not be found by Visual Studio Code.

To resolve this issue, you can try the following steps:

Check if the file "ui_demo.h" exists in the folder where your project is located. If it does not exist, you may need to create it or download it from another source.
Ensure that the file path to "ui_demo.h" is correctly specified in your source code. Check for any typos or errors in the file path.
If you have recently made changes to your project configuration or dependencies, you may need to rebuild or reinstall them to ensure that the necessary files are available.
If you are using a third-party library that requires "ui_demo.h", make sure that the library is properly installed and configured in your project.
If none of the above solutions work, try restarting Visual Studio Code or your computer to see if that resolves the issue