Hello there, I am wanting to create a custom FSKit extension, and am trying to get the sample passthrough project running: https://developer.apple.com/documentation/fskit/building-a-passthrough-file-system I have just followed the basic instructions from the tutorial above, so have: Selected my team for the signing certificate (required for FSKit module). Built and run. Enabled "Passthrough file system" under "File System Extensions". Made a test directory to mount to: mkdir ~/test But when I run the mount command, I get the following error: mount -t passthrough ~/Documents ~/test mount: Loading resource: The operation couldn’t be completed. (com.apple.extensionKit.errorDomain error 2.) mount: exec /Library/Filesystems/passthrough.fs/Contents/Resources/mount_passthrough for /Users/xxxxxxxx/test: No such file or directory mount: /Users/xxxxxxxx/test failed with 72 The contents of /Library/Filesystems/ is empty, so I don't know if allowing the extension is meant to add something to this directory or not. Any help would be much appreciated!