Uncaught TypeError: Cannot read property ‘add’ of undefined
at Editor.render (tiny_mce.js:1)
at Array.<anonymous> (tiny_mce.js:1)
at each (tiny_mce.js:1)
at tiny_mce.js:1
at j (tiny_mce.js:1)
at y (tiny_mce.js:1)
at i (tiny_mce.js:1)
What can i do to solve this? my customer needs the visual editor to edit his newsletters
Such kind of errors are usually due to a third party plugin injection some kind of code (or another tinymce version) in newsletter panels. Try to find out if the problem is there.