I’m trying to add a custom plugin as per the docs, into the themes/third_party/wyvern/plugins/ folder.
Here’s what I get:
[CKEDITOR.resourceManager.load] Resource name "oembed" was not found at "/themes/third_party/ckeditor/plugins/oembed/plugin.js?t=D08E".
As you can see, CK is trying to load the plugin from the ckeditor directory instead of your custom directory. Even though you are using CKEditor.plugins.addExternal to load it, *I think* CK tries to load it again when you add the plugin name to editor.extraPlugins. Then it throws the error and the WYSIWYG never renders.
One more weird thing…
Even if I don’t load any custom plugins, I get this error on the publish page, similar to the error above:
[CKEDITOR.resourceManager.load] Resource name "video" was not found at "/themes/third_party/ckeditor/plugins/video/plugin.js?t=D08E".