PropertySettings has unknown type EPiServer.Editor.TinyMCE.TinyMCESettings

Hi,

We recently migrate our EpiServer instance to the latest version.

Right now, we are trying to change a GlobalSettings which is inside a DataType and the DataType is inside a ContentType.

While doing this change, we are getting this error when adding a new Settings in the GlobalSettings:

Property PropertySettings has unknown type EPiServer.Editor.TinyMCE.TinyMCESettings, EPiServer.Cms.TinyMce

Would anyone of you had this issue and if so, how did you managed to change previously created GlobalSettings property.

Maybe this error is linked to this update?

https://world.episerver.com/blogs/Ben-McKernan/Dates/2018/3/an-updated-tinymce-package-has-been-released/

Thanks.