[plt-scheme] Question about user defined keybinding

Hi

I had a custom keybinding in v372. In v4.x, the same binding works
fine, but I figured I would check if it ought to be updated.

The docs (doc/drscheme/Keyboard_Shortcuts.html#(part._defining-shortcuts)
say you can use the form:

 (module mykeys framework/keybinding-lang

    ...)

But when I change my module to that language I get the error:

  Error when installing the keybindings C:\scheme\grant\drscheme\mykeys.ss:

  add-user-keybindings-file: The file
C:\scheme\grant\drscheme\mykeys.ss does not contain a module written
in the (lib "keybinding-  lang.ss" "framework") language.

Did I do something wrong?