We use full desktop clones with no profile management for a small group of users. This issue occurred for one of our users, regardless of any VDI desktop he accessed. Tried Win 10 1903 and 1809 along with Horizon Agent 7.7, 7.8, and 7.9, to no avail. His issue was due to the client he used to connect. For whatever reason, connecting via the latest Mac Desktop client 5.1.0 (13920831) as of this writing, resulted in this error message. Once he tried HTML5 access or the full Windows client via another computer, the issue went away.
