Case conversion keybindings not working

[Bhikhu]

I just finished compiling nano 5.8 and was playing around with the sample.nanorc file. Everything is honky-dory but I can't seem to make head or tail out of this particular keybinding,

bind Sh-M-U "Oc|sed 's/.*/\U&/' " main
bind Sh-M-L "Oc|sed 's/.*/\L&/' " main

Pressing "Shift+Alt+U" keys while a cursor is under a word produces this message in nano,
"Enterl line number, column  number: | sed 's/.*/\U&/'"
Entering line number or just the enter key doesn't seem to have any effect.  It produces this error,
"Invalid line or column number'

So how do I use this keybinding to convert the case?

Thanks.

Bhikhu

My Blog -> https://hakerdefo.github.io
My Projects -> https://github.com/hakerdefo

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