I've been attempting to import courses from AT v0.4.0 to 0.5.0 and seem to be successfully importing but am running into problems previewing. 

The server logs show all plugins, assets and themes are importing successfully but when I go to preview the newly imported course in the AT the preview window remains blank. Browser console shows this js error:

Uncaught Error: This component already exists in your project

at n.i.register (adapt.min.js:1)
at adapt.min.js:9
at Object.execCb (require.min.js:29)
at da.check (require.min.js:18)
at da.enable (require.min.js:23)
at Object.enable (require.min.js:27)
at da.<anonymous> (require.min.js:22)
at require.min.js:7
at y (require.min.js:6)
at da.enable (require.min.js:21)

Any clues as to what's happening here?