I installed the EPIServer 4.5 demo version and I got the following exception when I tried to create a new workflow:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
EPiServer.Workflow.WebControls.UserName.CreateChildControls() +34
System.Web.UI.Control.EnsureChildControls() +100
System.Web.UI.Control.PreRenderRecursiveInternal() +38
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Page.ProcessRequestMain() +1499
It occured when I selected the "Flow description" tab and Click on "Add a New Step" button for WebEditors, WebAdministrators or Administrators group.