I am following the SPIN Getting started tutorial on TBC ME. I am trying to 
add this constraint

# an invoice with no paidDate is > 90 days old
ASK WHERE {
    ?this :invoiceDate ?invoiceDate .
    OPTIONAL {
        ?this purchases:paidDate ?paidDate .
    } .
    FILTER ((!bound(?paidDate)) && (spif:duration("d", ?invoiceDate, 
afn:now()) > 90)) .
}

I get the warning below, though I have imported spinf.ttl

WARN [Thread-78] (E_Function.java:89) - URI 
<http://spinrdf.org/spif#duration> has no registered function factory

What am I missing?

Thanks,

Monika


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