(ToolsNet Web App) ToolsNet Web App Does Not Launch and a "NullReferenceException: Object reference not set to an instance of an object" Occurs for Errors Relating to Get Session Facade

Cause: Internet Information Services (IIS) is not allowed to generate a session cookie.

Solution:

Open the Internet Information Services (IIS) Manager and navigate to Sites > Default Web Site > ToolsNet > Configuration Editor.
Under Section:, select system.web/sessionState and change the mode setting into InProc.
Restart the IIS service.