Expresstools QldetachSet command

I'm not able to use this command for some reason.
Loading V16 of ExpressTools & issuing the command while leaders are selected I get this:
EXPRESSTOOLS

Opposite corner:

: QLDETACHSET
; ----- Error around expression -----
; (C:QLDETACHSET)
;
"no function definition ; expected FUNCTION at [eval]"
:

Any ideas?

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