To be a bit clearer, I'm formatting string attributes using a function I've defined in the Codeblock. It has 1 argument, the input field, and outputs to a different field. I run fix(!PIN!) and get back fix(u"CARV-000001-000001-B000000") in the error. I generalized to functionname and fieldvalue because I've had this same problem several times before, and while I can usually get it to work after playing with it for a while, I'm curious as to why it happens and the best way to avoid/deal with it.
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