Hi Paul Dench,
Thank you for getting back to me.
To be honest this does not seem like an error related to Sitefinity only. I think that you will get this kind of error in a regular ASP.NET web site on which you have added this .dll and which ASP.NET site has the Global.asax
file in its root directory. A Sitefinity website contains this file by default. And during compilation of you get the error because you cannot have more than one Global.asax file in one application.
You can either re-factor your code in the .dll so that the logic from the Global.asax file there is moved to the one in your Sitefinity website, so both files do not conflict at compilation of the website. If you do not have any code in Global.asax in GLAdvisor_deploy project you can remove it as this file is optional. Or rebuild your GLAdvisor_deploy project so that it has its own bin directory so its asax file is compiled into it. You should also clean the Temporary ASP.NET files folder.
the Telerik team