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

    Status: Validated

    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. Navigate to Central Administration > Nintex workflow management > Web application activation.

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

    If this doesn't work, add the following entries 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" /
    This is caused by missing entries in the web.config file of one or more Web Front End servers in the Farm.