Looker Access Filters

[mandersen04]

Hello,

For my job, I am updating a model with an explore extend. In that extend, I am joining the base explore to a view that doesn't have an explore yet. I'm creating an explore from that view as part of the same update.

The primary reason for the join is to create an access filter from one of the fields in that view. For some reason, when I validate the LookML, I keep getting an "unknown access filter" error. I know the view exists, and that the field exists. I will say that the view doesn't have a primary key at the moment, but I've been told that shouldn't matter.

What kinds of issues could be causing this kind of error? I know I haven't provided a lot of detail, since this is for my job, but what are some common causes that I might look into? Do I need to make the view into an explore first, and then add the access filter, or is it something different?

Thank you in advance.