B4J Question [ABMaterial] ABMPdfViewer some chinese characters substituted by "!"

Hi, I use ABMPdfViewer in my web page to display pdf file which contains chinese contents,

the problem is that some chinese characters were substituted by "!", although the pdf file is display no any problem with Adobe Reader DC.

B4X:
    Dim pdf As ABMPDFViewer
    pdf.Initialize(page, "pdf", 800, "../Reports/MyFirstReport.pdf","")
    pdf.PreparePrintingText = "Preparing to print..."
    pdf.ReadDirection = ABM.PDF_READDIRECTION_LTR
    pdf.ForcedLanguage=""
    pdf.AllowDownload = True
    pdf.AllowOpen = False
    pdf.AllowPrint = True
    pdf.AllowSideBar = True
    pdf.AllowViewBookmark = False
   
    page.Cell(2,1).AddComponent(pdf)
May I know how to set pdf.ForcedLanguage="" ?

Untitled.png

Thanks
Kow
 
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