Unable to get the FindNext property of the Range Class

I keep getting that error when I'm running my macro. When I debug, it points me to the bolded line in the code below.

The larger macro I'm running this function in runs this function some 101 times without error before this happens.

The values of the parameters are as follows when it gives me the error:
Find_Exact("hchen", ws1, "B:B")

The first parameter is the only one that changes in the previously mentioned running of this function.

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What could possibly be the problem??

Thanks for the help.

Maybe this:

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Does xlWhole guarantee that cell1.value = cell2.value? What does search_format specify?

Help is your friend.