I want to start my workflow with a SharePoint Designer created Custom Action (ribbon button)
The steps I did were:
1. create workflow with
Form Type = Custom
Start Page = empty
2. create a custom Action "Start Workflow"
Then if i use the Action Button, I get an error
An exception occurred while rendering the Ribbon on the SharePoint Page.The following exception was thrown : System.ArgumentException: The Ribbon Tab with id: "Ribbon.Read" has not been made available for this page or does not exist. Use Ribbon.MakeTabAvailable().
at Microsoft.Web.CommandUI.Ribbon.Render(HtmlTextWriter writer)
at Microsoft.SharePoint.WebControls.SPRibbon.Render(HtmlTextWriter writer)
I'm not sure, what's wrong - does anybody have an idea ?