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    Nintex Knowledge Base

    Error "at System.Web.UI.MasterPage.CreateMaster..." creating workflow in 2010 mode

    Summary
    When trying to create a workflow in any 2010 mode site on a 2013 Farm, the following error might occur: at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, Dictionary contentTemplateCollection)

    Solution
    Redeploy the compatibility solution "NintexWorkflow2013BackwardsCompatabilityUI.wsp" from: Central Administration > System Settings > Manage Farm Solutions.

    If the deployment does not succeed using the UI and the error still appears, use the following PowerShell command:
    Install-SPSolution -Identity nintexworkflow2013backwardscompatibilityui.wsp -GACDeployment -CompatibilityLevel 14 -Force

    Note: the "-Force" operator should only be used as a last resort.

    This will update the NintexWorkflow files in the 14 hive.
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