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Issues with text extraction

I am a chinese user.When I use Aspose.Pdf.Kit to extract all text from pdf document,there is always exceptions of character.I dont know why.Can you help me? Thanks a lot

What I got is :

System.IO.Exception:Unexpected characters

this is the pdf document

Thanks for consideing Aspose.

After analysing contents of your pdf document, we find the problem is produced because the file itself is a kind of image format. The funtion extracting text is designed for those kind of pdf documents which contain valid information in text formatting.

Thank you very muchSmile [:)]