Request search returns error

Request search returns error

I used to be able to search (and rely on it) but yesterday it began giving me an error whenever I try searching requests.  No one else in IT is receiving the error.  I've cleared cache, and I get the same error in Chrome, FF and IE.  Not sure what to do but I need the search ability back!
Thanks...  here's the error screen I see when trying any search.

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