[@robin-w Moderator 8 years, 2 months ago]

that error suggests that your theme Stockholm and file js/plugins.js is the problem.

So it initially looks like enabling tinymce within bbpress is calling the tinymce or other code within your theme – the bbpress code you are using just turns on the wordpress function.

to prove, try switching as a test to a default theme, such as twentyseventeen and see if the error goes away