Invalid procedure call or Argument (please help)

I have this code that was working to export all my tabs based of their names (which are variables)
Now i am getting an error code for "Invalid procedure call or argument"

What needs to change?

 Sub PDFTabs()
Dim ws As Worksheet
    For Each ws In Worksheets

        ws.ExportAsFixedFormat xlTypePDF, "C:\Users\Glen.Hervey\Documents\MAA Exports\" & ws.Name & ".pdf"
    Next ws
End Sub