Method differs only by optional parameters error
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    Function GetAuthor(entityId As Integer, authorId As Integer, Optional ByVal authorImageWidth As Integer = 250) As String
    
    Function GetAuthor(entityId As Integer, authorId As Integer, feedId As Integer, Optional ByVal authorImageWidth As Integer = 250) As String

I don't know whats wrong with this. I am getting this error message. 

'Function GetAuthor(entityId As Integer, authorId As Integer, [authorImageWidth As Integer = 250]) As String' and 'Function GetAuthor(entityId As Integer, authorId As Integer, feedId As Integer, [authorImageWidth As Integer = 250]) As String' cannot overload each other because they differ only by optional parameters.