looks to be a server redirect thing.

https://forums.alliedmods.net/showthread.php?t=269784

not sure on that error.. the map is pretty big though.. I will look at optimizing the nav file for the next release

i ve added this map on my server rotation https://www.gametracker.com/server_info/185.212.226.101:27015/ you can nominate & rtv it as you wish , settings are wild west theater 18 slots with reduced respawn time in push.

so far it's working but i get this error message in logs:
"CreateFragmentsFromFile: 'maps/bb_valleyofthekings_push_b2_ws.nav' size exceeds net_maxfilesize limit (16 MB)."