I am currently trying to view a .PST file using GroupDocs.Viewer 23.1.0 in an ASP.NET MVC application using .NET Framework 4.8, when I try to view a PST file with PDF settings I get the following error: “System.NullRefer…...it seems to have fixed the issue, Thank you. vladimir.litvinchik...Viewer/23.3.0 + fix for this issue. The fix will be a part of the...