ATLauncher AccessDeniedException When Deleting temp/natives Folder

What the log looks like

Error trying to delete the directory [^\r\n]*\\temp\\natives-
com\.atlauncher\.utils\.walker\.DeleteDirVisitor\.visitFile
sun\.nio\.fs\.WindowsException\.translateToIOException[\s\S]{1,800}com\.atlauncher\.utils\.FileUtils\.deleteDirectory

How to fix it

1. Do not troubleshoot this AccessDeniedException directly; scroll up in the ATLauncher console above the 'Oh no. Minecraft crashed' message to see what actually crashed the game.
2. In ATLauncher, go to the Instances tab, click 'Open Folder' on your modpack, and check the 'crash-reports' folder or 'logs/latest.log' to find the real mod or game error.
3. Update ATLauncher to version 3.4.20.1 or newer, where the developers suppressed this harmless cleanup error so it no longer hides the real crash log.
4. If leftover files remain, close ATLauncher completely and manually delete any old 'natives-' folders inside your ATLauncher 'temp' directory.

Check your own log