When working with a project, an error may be encountered that states:

600 | File {data_file} not found ({path_to_data_file})
2 | No such file or directory


This can occur when a project has its parent directory's name changed while it is still opened in 4D. To fix this, rename the folder back to its original name. Avoid updating a project's folder name while it is still running, as it can cause issues with 4D locating certain files. Note that updating a project's directory name will also remove it from the list of recent projects when 4D is re-opened.