HTML Module You Must be in Edit Mode to Enter Content

A website which had recently been DNN upgrades to version 9 was unable to edit the content of the HTML module.

When adding a new html module an error message was showing:

You must be in Edit Mode to enter content, and then you can use the Module Action Menu or Module Action Buttons to manage content 

Resolving the text editor You must be in Edit Mode to enter content error following an upgrade to DNN 9.

The cause of the error is the configured editor.

At the menu options on the left select Site Settings

From the tabs across the top select Site Behaviour.

And the sub menu option of More.

On this tab click on the box Open HTML Editor Manager.

The old entry of DotNetNuke.RadEditorProvider is shown with the message

The current HTML Editor Provider is not supported by this version of the HTML Editor Manager. 

Select the other option DNNConnect.CKE. Click on Change.

To finish click on the link BACK TO SITE BEHAVIOUR at the top left hand corner.

I found that the text/HTML module which was previously showing the You must be in Edit Mode to enter content… error message still showed this text.

I clicked to edit the module. The default empty content text of Add Content… was shown. I was able to edit the content and save as normal.