Macro Error - Invalid Procedure Call or Argument

I have a macro with the following code:

Private Sub Btn_SavePDF_Click()

  Dim Filename As String
  Application.DisplayAlerts = False

  template_file = ActiveWorkbook.FullName
 
  Filename = ActiveCell.Value

  filesavename = Application.GetSaveAsFilename( _
  InitialFileName:="C:\" + Filename + ".pdf", _
  fileFilter:="PDF Files (*.pdf), *.pdf")
   
    If filesavename = False Then
        Exit Sub
    End If
   
    FilePath = filesavename
    
   
    file_name_saved = ActiveWorkbook.FullName
   
    ActiveWorkbook.ExportAsFixedFormat Type:=xlTypePDF, Filename:=filesavename, _
Quality:=xlQualityStandard, IncludeDocProperties:=True, IgnorePrintAreas:=False, _
OpenAfterPublish:=False

     Application.DisplayAlerts = True
End Sub

The macro prompts the user to save the file to computer. When the OK button is clicked, it presents the "Invalid Procedure Call Or Argument" error message. I believe this has something to do with the specific computer. This code works on other systems (deployed this code to 10 different machines and this is the only one with this issue).

Any ideas?