Error opening HEAT: An error occurred when trying to create a controller of type 'SaaS.WebUI.MVC.AccountController'
This error is related to the HEATCache folder, please follow these steps to solve it:
1.- Stop the IIS (iisreset /stop)
2.- Delete the HEATCache folder (usually in C:\Temp)
3.- Delete the folders inside Microsoft ASP.NET Temporary :
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files
4.- Run the System Configuration Wizard