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Groupdocs.Signature giving Object reference error



I am trying to use Groupdocs.signature in my application, but its giving object reference error. I created one demo application using the example given on the site, which worked fine. but as soon as I add another page in-between[Like Open Signature document page on a button click], the application gives object reference error.

You can find working and non working demo from here.
Please help me to solve this issue. I don’t understand what I am missing out.



Thank you for the request. I have fixed your project example. Please download it here.

Best regards.