Hi,
The error message means that there are two types 'add' with unique key attribute 'name' set to 'CrystalImageHandler.aspx_GET' in web.config.
Please make sure there is not same type with 'name' set to 'CrystalImageHandler.aspx_GET' in your web.config.
When ASP.NET is starting, the web.config file will be integrated with inherited web.config. So please make sure there is not type 'add' with unique key attribute 'name' set to 'CrystalImageHandler.aspx_GET' in parent web.config file.
I look forward to receiving your test results.