Error With My Search

Hi Folks,
I have a search option on my form that allows the user to search a table by either first name or last name. They double click in the list box on the name they want. I am using the exact same code in another one but it doesn't seem to work. The error message I get is " The Microsoft jet database engine doesn't recognise (the name I selected) as a valid field name or expression"
I think that the error is in the double click event in the code. This is as follows:
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Private Sub SearchList_DblClick(Cancel As Integer)

On Error GoTo Err_SearchList_DblClick

Dim db As DAO.Database
Dim rst As DAO.Recordset

DoCmd.OpenForm "Priests"

Set rst = Forms![Priests].RecordsetClone

rst.FindFirst "[LastName] = " & Me.SearchList
Forms![Priests].Bookmark = rst.Bookmark

DoCmd.Close acForm, Me.Name

Exit_SearchList_DblClick:
Exit Sub

Err_SearchList_DblClick:
MsgBox Err.Description
Resume Exit_SearchList_DblClick

End Sub
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Any suggestions greatly appreciated.
Thanks,
COlin.