[racket] Custom Keybindings - Editor Insert Poofed

Up until recently the following worked for me.  Create a custom keybindings
file.  Add the following line.

(keybinding "c:\\" (λ (editor evt) (send editor insert "λ")))

And a Ctrl:\ would insert a λ for me.  Recently this has stopped working as
reported below.  Any ideas on how to bring it back?

Thanks,

Ray

>
> The key binding is invoked, however, I'm seeing the following in a pop-up.
>
> Error running keybinding
> send: no such method
> method name: insert
> class name: cts/version/tool.rkt:176:9
>
>
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