I forgot you have to give it write permissions (minified)

halyde/apps/mkdir.lua

@@ -1,14 +1 @@
-local directory = ...
-local fs = import("filesystem")
-
-if not directory then
-  shell.run("help mkdir")
-  return
-end
-if directory:sub(1, 1) ~= "/" then
-  directory = fs.concat(shell.workingDirectory, directory)
-end
-if fs.exists(directory) then
-  print("\27[91mAn object already exists at the specified path.")
-end
-fs.makeDirectory(directory)
+Error: no such file. (``)