Progressbar keeps loading

Hi, I updated my application to Mx 5.21.2 from Mx 4.8.9. When i start it local, sandbox or test environment the progressbar keeps loading. On Mx 4.8.9 it doesn't. Someone recognize this error and have an idea what is the reason the progressbar keeps loading? I have everywhere where i use the progressbar a progressbar message. The progressbar that is loading dont have a progressbar message. Console said: index.html:34 GET http://localhost:8080/styles/css/custom/false index.html:34 GET http://localhost:8080/styles/css/lib/false 404 (Not Found) The XMLHttpRequest progress event property 'position' is deprecated and will be removed in M50, around April 2016. Please use 'loaded' instead. See for more details. Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check Error: declare mlogin.widget.LoginButton: unknown base class. Did you use dojo.require to pull it in?(…) Kind Regards, Sonny van Rein
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