My Upgrade from 4.9.5 to 5.1.2 completed without any error messages, however the site fails to load.
i get the error below on primary portal, and default dnn startup page on other portals "dnnpage DotNetNuke Error " (no messages shown)
An error has occurred.
DotNetNuke.Services.Exceptions.PageLoadException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases. ---> System.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases. at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Utilities.MSAJAX.Register(Page objPage) at DotNetNuke.UI.Utilities.MSAJAX.RegisterClientScript(Page objPage, String Path) at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientScriptBlock(Page objPage, String key) at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientReference(Page objPage, ClientNamespaceReferences eRef) at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientReference(Page objPage, ClientNamespaceReferences eRef) at DotNetNuke.UI.Utilities.DNNClientAPI.EnableMinMax(Control objButton, Control objContent, Int32 intModuleId, Boolean blnDefaultMin, String strMinIconLoc, String strMaxIconLoc, MinMaxPersistanceType ePersistanceType, Int32 intAnimationFrames, String strPersonalizationNamingCtr, String strPersonalizationKey) at DotNetNuke.UI.Utilities.DNNClientAPI.EnableMinMax(Control objButton, Control objContent, Boolean blnDefaultMin, String strMinIconLoc, String strMaxIconLoc, MinMaxPersistanceType ePersistanceType, String strPersonalizationNamingCtr, String strPersonalizationKey) at DotNetNuke.UI.ControlPanels.IconBar.Page_PreRender(Object sender, EventArgs e) in C:\@LocalFiles\@WebSites\MegaTechDNN\Admin\ControlPanel\IconBar.ascx.vb:line 381 at System.Web.UI.Control.OnPreRender(EventArgs e) at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---