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Cannot view PDF has digital signature

Dear friends,

I have problems when use syncfusion xamarin pdfviewer control to open a signed pdf. I use SampleBrowser project downloaded with Syncfustion Control.
My app forced to close and throw null exception (with file01.pdf) and invalidOperationException (with file02.pdf).
I attached files and error details.

My environment:

Microsoft Visual Studio Community 2017
Version 15.9.7
VisualStudio.15.Release/15.9.7+28307.423
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Community

C# Tools   2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus   1.1.49 (remotes/origin/d15-8@ee674f3)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Mono Debugging for Visual Studio   4.13.12-pre (9bc9548)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

ProjectServicesPackage Extension   1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

ResourcePackage Extension   1.0
ResourcePackage Visual Studio Extension Detailed Info

ResourcePackage Extension   1.0
ResourcePackage Visual Studio Extension Detailed Info

Syncfusion Xamarin Project Templates   16.4.0.42
A multi-project template for building iOS, Android, and Windows apps using Syncfusion Xamarin components.

Syncfusion Xamarin Toolbox   16.4.0.42
Syncfusion Essential Studio for Xamarin Toolbox Visual Studio extension.

Visual Basic Tools   2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.2 for F# 4.5   15.8.0.0.  Commit Hash: 6e26c5bacc8c4201e962f5bdde0a177f82f88691.
Microsoft Visual F# Tools 10.2 for F# 4.5

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

Xamarin   4.12.3.80 (d15-9@914127c74)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer   4.16.13 (45a16efd4)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates   1.1.128 (6f5ebb2)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK   9.1.7.0 (HEAD/ba9da7a76)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK   12.2.1.15 (d60abd1)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Microsoft Window 10 Pro.

Testing on Android Emulator:
- Android 7.1
- Android 9.0

I really don't know why.
Thank you very much for any helps.

Best regards,
Thao