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

Document created by butlerj Support on Dec 18, 2018
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ISSUE
When trying to access "Scheduled Workflows" from Site Settings, the following error occurs:
 
Server Error in '/' Application. 
Parser Error Message: Unknown server tag 'SharePoint:ClusteredDirectionalSeparatorArrow'
ERROR CODE
RESOLUTION

Option 1

Upgrade to Nintex Workflow 2013 build 3.1.10.0, Nintex Workflow 2010 build 2.4.10.0 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=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" Namespace="Microsoft.SharePoint.WebControls" TagPrefix="SharePoint" %> directly below the existing <%@ Register Assembly="Nintex.Workflow.ServerControls, Version=1.0.0.0, 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.
ADDITIONAL INFORMATION
This was a known defect within Nintex Workflow build 3.1.9.0 and 2.4.9.0.
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