error on open some pdf

[robtomasi]

i have this error on open some pdf, on this statement
foreach (var page in document.GetPages()) of class OpenDocumentAndExtractWords in the public static string Run(string filePath)
any ideas?

thanks a lot

UglyToad.PdfPig.Core.PdfDocumentFormatException
HResult=0x80131500
Messaggio=The filter for the stream was not a valid object. Expected name or array, instead got: 18 0.
Origine=UglyToad.PdfPig
Analisi dello stack:
in UglyToad.PdfPig.Filters.DefaultFilterProvider.GetFilters(DictionaryToken dictionary)
in UglyToad.PdfPig.PdfExtensions.Decode(StreamToken stream, IFilterProvider filterProvider)
in UglyToad.PdfPig.Parser.PageFactory.Create(Int32 number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers, Boolean clipPaths)
in UglyToad.PdfPig.Content.Pages.GetPage(Int32 pageNumber, Boolean clipPaths)
in UglyToad.PdfPig.PdfDocument.GetPage(Int32 pageNumber)
in UglyToad.PdfPig.PdfDocument.d__32.MoveNext()
in ProvaLeggiPdfC.OpenDocumentAndExtractWords.Run(String filePath) in C:\lavoro\Vs2019\ProvaLeggiPdfC\ProvaLeggiPdfC\PingExample\OpenDocumentAndExtractWords.cs: riga 19
in ProvaLeggiPdfC.frmAutostrade.button4_Click(Object sender, EventArgs e) in C:\lavoro\Vs2019\ProvaLeggiPdfC\ProvaLeggiPdfC\frmAutostrade.cs: riga 40
in System.Windows.Forms.Control.OnClick(EventArgs e)
in System.Windows.Forms.Button.OnClick(EventArgs e)
in System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
in System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
in System.Windows.Forms.Control.WndProc(Message& m)
in System.Windows.Forms.ButtonBase.WndProc(Message& m)
in System.Windows.Forms.Button.WndProc(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
in System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
in System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
in System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
in System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
in System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
in System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
in System.Windows.Forms.Application.Run(Form mainForm)
in ProvaLeggiPdfC.Program.Main() in C:\lavoro\Vs2019\ProvaLeggiPdfC\ProvaLeggiPdfC\Program.cs: riga 19

Questa eccezione è stata generata in origine nello stack di chiamate seguente:
[Codice esterno]
ProvaLeggiPdfC.OpenDocumentAndExtractWords.Run(string) in OpenDocumentAndExtractWords.cs
ProvaLeggiPdfC.frmAutostrade.button4_Click(object, System.EventArgs) in frmAutostrade.cs
[Codice esterno]
ProvaLeggiPdfC.Program.Main() in Program.cs

[EliotJones]

This looks like it was raised as issue #457