Average of days for a report/metric

I am trying to run a report using the following formula that references another sheet

CRU Range 1 - is the name of the investigator, CRU Range 3 is the type of case and i need an average of the days closed (which is CRU Range 4).

So the result should be Vanessa's average days to close a CRU -Phase 1 case is 25 days.

The formula i have right now(below) is giving me an unparseable error.

=AVERAGEIF({CRU Range 1} "Vanessa Diaz", {CRU Range 3}, "CRU-Phase 1", {CRU Range 4}, ="")

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