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    Error "Server Error in '/' Application ... Unknown server tag 'SharePoint:ClusteredDirectionalSeparatorArrow'" Accessing WorkflowScheduleList.aspx

    When trying to access "Scheduled Workflows" from Site Settings, the page errors with: Server Error in '/' Application. Parser Error Message: Unknown server tag 'SharePoint:ClusteredDirectionalSeparatorArrow'


    Option 1

    Upgrade to Nintex Workflow 2013 build, Nintex Workflow 2010 build or a later version.

    Option 2

    If updating is not possible, the WorkflowScheduledList.aspx page can be edited to work around this issue:
    1. On each Web Front End server in the farm navigate to: C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\NINTEXWORKFLOW\WorkflowScheduleList.aspx.
    2. Add: <%@ Register Assembly="Microsoft.SharePoint, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" Namespace="Microsoft.SharePoint.WebControls" TagPrefix="SharePoint" %> directly below the existing <%@ Register Assembly="Nintex.Workflow.ServerControls, Version=, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12"
          Namespace="Nintex.Workflow.ServerControls" TagPrefix="Nintex" %>.
    3. Save the WorkflowScheduleList.aspx page.
    4. Run an IISReset on the Web Front End servers.