Tag Library supports namespace: http://primefaces.org/ui, but no tag was defined for name: datePicker

If you are developing primefaces jsf application and you receive the following error message

<p:datePicker> Tag Library supports namespace: http://primefaces.org/ui, but no tag was defined for name: datePicker

Then you have to be aware, that this component is only available with the upcoming version of primefaces, which is 6.3. Compare to https://www.primefaces.org/road-primefaces-6-3/