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

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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'

Upgrade to Nintex Workflow 2013 build 3.1.10.0, Nintex Workflow 2010 build 2.4.10.0 or a later version.

If updating is not possible, the WorkflowScheduledList.aspx page can be edited to work around this issue:

On each Web Front End server in the farm navigate to: C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions15TEMPLATELAYOUTSNINTEXWORKFLOWWorkflowScheduleList.aspx.
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" %>.
Save the WorkflowScheduleList.aspx page.
Run an IISReset on the Web Front End servers.

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