Solved! Sitecore WebEditRibbon Issue

Today I got an email mentioning about a broken page editor experience after an upgrade from Sitecore 6.6 to 8. Below control started throwing exception while rendering.

<sc:XslFile ID="xslBottomModules" Path="/xsl/Bottom.xslt" runat="server" />

Exception:

Below message is displayed where above control is present.

On clicking the yellow triangle we get exception details as below

System.Exception: Could not resolve type name: Sitecore.Web.UI.WebControls.WebEditRibbon, Sitecore.Kernel (method: Sitecore.Configuration.Factory.CreateFromTypeName(XmlNode configNode, String[] parameters, Boolean assert)).

   at Sitecore.Diagnostics.Error.Raise(String error, String method)

   at Sitecore.Configuration.Factory.CreateType(XmlNode configNode, String[] parameters, Boolean assert)

   at Sitecore.Configuration.Factory.CreateFromTypeName(XmlNode configNode, String[] parameters, Boolean assert)

   at Sitecore.Configuration.Factory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)

   at Sitecore.Web.UI.WebControls.XslFile.ReadXslExtensions()

   at Sitecore.Web.UI.WebControls.XslFile.get_XslExtensions()

   at Sitecore.Web.UI.WebControls.XslFile.AddExtensionObjects(XsltArgumentList list, Item item)

   at Sitecore.Web.UI.WebControls.XslFile.DoRender(HtmlTextWriter output, Item item)

Solution for this is simple as Sitecore.Web.UI.WebControls.WebEditRibbon class now moved to Sitecore.ExperienceEditor.dll in Sitecore 8.

Once we updated the below entry under <xslExtensions> in web.config everything started working fine.

<extension mode="on" type="Sitecore.Web.UI.WebControls.WebEditRibbon, Sitecore.Kernel" namespace="http://www.sitecore.net/webedit" singleInstance="true" />