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Question:
What can i do, if i am unable to get property setrectangle of undefined or null reference?

 
Answer:
This error message is indicative of an unsupported browser being used.

Please consult the following links for the latest supported browsers for each product.
Fortis: http://pub.docuware.com/en/fortis-technical-specifications
FortisBlue : http://pub.docuware.com/en/fortisblue-technical-specifications

For older versions of Fortis & FortisBlue, please consult the installation guide.

This article lists what browsers are supported:

Fortis:
KBA-35334

FortisBlue:
KBA-35378