Wildcards not working in zotfile

edited December 13, 2022
What am I doing wrong here?
Made a Zotfile wildcard for the "edition" field in books (see below).
{%a} - {%t}, {%edition}"E "({%y}) should make --> Author - Title of Book, 9E (1983)

But I keep getting the error below, and no renaming is done.
[Please select a zotero item to see a preview of your renaming rules]


{
"edition": {
"book":{"field":"edition"}
}
}


What am I doing wrong here?
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