Error:A Web Part or Web Form Control on this Page cannot be displayed or imported. The type is not registered as safe.
Solution: Go to
C:\Inetpub\wwwroot\wss\VirtualDirectories\[Port]
Open Web.Config
Add Below tage above to “/SafeControls”
SafeControl Assembly=”SourceCode.Workflow.TaskList, Version=4.0.0.0, Culture=neutral, PublicKeyToken=16a2c5aaaa1b130d” Namespace=”SourceCode.Workflow.TaskList.WebPart” TypeName=”*” Safe=”True”