Topic
When opening one of the links under Nintex Administration, the following error might occur:
"Updates are currently disallowed on GET requests. To allow updates on a GET, set the 'AllowUnsafeUpdates' property on SPWeb."
This can happen for any one of the links within Nintex Administration but the most common would be the Licensing page. It can happen because sometimes there is a missing ULS service or Category.
Instructions
In order to resolve this issue, the main intent is to add those missing ULS services or categories into the farm. The below options are listed as what you should try first to resolve this issue.
Option 1. Navigate to Central Administration > Site Setting > Manage Site Features > Deactivated and then reactivate the Nintex Workflow Admin feature.
Option 2. Run the following from one of your SharePoint servers in the SharePoint Management Console:
Add-Type -AssemblyName "Nintex.Administration, Version=1.0.0.0, Culture=neutral, PublicKeyToken=913f6bae0ca5ae12"
$bindingFlags = 'static','nonpublic','instance'
$method = [Nintex.Administration.Common.ULS].GetMethod('get_Local', $bindingFlags)
$uls = $method.Invoke($null, $null)
$uls.Update()
$uls.Farm.Update()
Option 3. This would be last resort but if the above two options didn't provide any resolution then the next recommendation would be to retract the Nintex solutions and re-install the Nintex product into your environment.
