NullReferenceException: Object reference not set to an instance of an object
  at PdfSharp.Pdf.PdfPage.Initialize () [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.PdfPage..ctor () [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.PdfPages.Add () [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.PdfDocument.AddPage () [0x00000] in <filename unknown>:0
  at PDFExportJob.ThreadFunction () [0x0016c] in C:\Users\Software Student\Desktop\PhazerConfig-New\Assets\Scripts\Utility\BarManager.cs:6214
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
PDFExportJob:OnFinished() (at C:\Users\Software Student\Desktop\PhazerConfig-New\Assets\Scripts\Utility\BarManager.cs:6119)
PDFExportJob:Update() (at C:\Users\Software Student\Desktop\PhazerConfig-New\Assets\Scripts\Utility\BarManager.cs:6095)
<SavePDF>c__Iterator4:MoveNext() (at C:\Users\Software Student\Desktop\PhazerConfig-New\Assets\Scripts\Utility\BarManager.cs:5180)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)