VB.Net Iterator gives unused declaration error?

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VB

I have been trying to fix a bit of code for the past few days but keep getting an error when I add the iterator phrase to my sub routines. An example of this is as follows:

Public Iterator Function Matches() As IEnumerable(Of FileInfo)
    For Each rootPath As String In m_paths
        Dim path As String = rootPath.Trim()
        For Each fi As FileInfo In _matches(path)          
            Yield fi
        Next fi
    Next rootPath
End Function

At the top where my Function reads - Public iterator function Matches()
if the iterator word is not there then I cannot use the Yield property and if the iterator is there then the word Matches() goes to unused declaration and does not work? Can anyone shed some light as to why this is happening

Thank you in advance for your time :)