I don't know where to see the stack trace, I just get this message on the pageThere's a "Server log" element in the "System" perspective (in C1 4.2, in the earlier versions it is in the top menu)
Try commenting the following line to see if the exception disappears
// Layout = "~/App_Data/Razor/Layout/SyncroSystemMasterLayout.cshtml";
If so, the error must be in the SyncroSystemMasterLayout.cshtml file