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The thread 0x30e70 has exited with code 259 (0x103)

I am getting this error “The thread 0x30e70 has exited with code 259 (0x103)” when calling the pdf2Print.Pages(pg).ColorType. What causes this?

Select Case pdf2Print.Pages(pg).ColorType
Case Aspose.Pdf.ColorType.BlackAndWhite, Aspose.Pdf.ColorType.Grayscale, Aspose.Pdf.ColorType.Undefined
printBWPgCount += 1
Case Else
printColorPgCount += 1
End Select


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