Last Tested: March 16, 2021
This is an error that comes up when using dimension fill. The easiest solution is to turn off dimension fill for that dimension on the explore.
Basically, dimension fill only works on "enumerations." That is, there needs to be a clear start and end point for filling. In the case of dates, Looker needs to know which date to start at and which date to end at.
This content is subject to limited support.