What could be wrong with the code

[Simwinga Simwinga]

. quietly forval i/`=_N'{
.
. foreach v of var Topic_1-Topic_4 {
.
. local all `"`all' `"`=`v'[`i']'"'"'
.
. }
.
. local all : list uniq all
.
. replace _NTopics = `: list sizeof all' in `i'
.
. local all
.
. }
invalid syntax
r(198);

[William Lisowski]

Welcome to Statalist.

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[Simwinga Simwinga]

Thank you for the guide.