Hi Peter,
Thank you for your interest in Essential PDF.
I regret that I was not able to reproduce the issue in our testing environment. This issue may occur due to the usage of interop assemblies which throws this exception in some environment because of the IIS restrictions. Some of the solutions suggested in websites for these kind of exception are :
1) Set full control to ASP .NET permission
2) Restart IIS
Kindly go through the video clip for more information,
http://www.syncfusion.com/support/user/uploads/SampleVideo_de297d7b.zipBasically, the Windows 2003 Server defaults to an internet security configuration which may not allow you to access the URL. You may have to relax or disable the enhanced security configuration to allow access to the pages you want to render. If removing the internet enhanced security configuration component is an option, you can do so from the "Add/Remove Windows Components" section of the "Add or Remove Programs" control panel. The internet enhanced security configuration component should be listed as "Internet Explorer Enhanced Security Configuration".
Please try this and let us know if you need any further details.
Regards,
Suba