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

ISSUE
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=1.0.0.0, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12 could not be found or it is not registered as safe.
ERROR CODE
RESOLUTION
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=1.0.0.0, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12" Namespace="Nintex.Workflow.ServerControls" TypeName="*" Safe="True" />
<SafeControl Assembly="Nintex.Workflow.ServerControls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12" Namespace="Nintex.Workflow.ServerControls.WebParts" TypeName="*" Safe="True" /
ADDITIONAL INFORMATION
This is caused by missing entries in the web.config file of one or more Web Front End servers in the Farm.
RELATED LINKS
Version history
Revision #:
1 of 1
Last update:
‎11-20-2018 08:33 AM
Updated by: