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    Error "The control type 'Nintex.Workflow.ServerControls.ApproverSecurityCheck' is not allowed on this page"

    When editing a Request Data task, the following error might occur: Sorry, something went wrong The control type 'Nintex.Workflow.ServerControls.ApproverSecurityCheck' is not allowed on this page. Additionally, the following error appears in the ULS logs: 'Nintex.Workflow.ServerControls.ApproverSecurityCheck' is not allowed on this page. The type Nintex.Workflow.ServerControls.ApproverSecurityCheck, Nintex.Workflow.ServerControls, Version=, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12 could not be found or it is not registered as safe.

    Web.config entries need to be re-added, either through re-activation of the Nintex features or manually. You can re-perform the web application activation step in: 

    Central Administration > Nintex workflow management > Web application activation.

    Note: Make sure to tick "All Content Web Applications".

    If this doesn't work, you will need to add the below entries manually to the web.config file of each Web Front End server:

    <SafeControl Assembly="Nintex.Workflow.ServerControls, Version=, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12" Namespace="Nintex.Workflow.ServerControls" TypeName="*" Safe="True" /> <SafeControl Assembly="Nintex.Workflow.ServerControls, Version=, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12" Namespace="Nintex.Workflow.ServerControls.WebParts" TypeName="*" Safe="True" /