Netchannel: unknown net message (45) causing server to be impossible to connect to

When I installed FA:S I now get the Netchannel: unknown net message (45) error when I try and connect to my server, it freezes on ‘retrieving Server Info’ and I cannot connect to my server.
Sorry if this is the wrong section for this!

Here’s my console log when I connect to my server.

] retry
Commencing connection retry to 192.223.26.64:27015
Connecting to 192.223.26.64:27015…
Connected to 192.223.26.64:27015

Sandbox
Map: gm_flatgrass
Players: 2 / 30
Build: 5914
Server Number: 1

DarkStorm Build |Hiring Staff|Wire|FA:S|ACF|sCars|TDM|PAC3|AdvDupe2|24/7|Bronies Welcome|
http://darkstorm.site.nfoservers.com/loading/Crystal_Load/index.php?steamid=%s
sandbox
gm_flatgrass
30
76561198013757034
Attemped to precache unknown particle system “impact_dirt_d”!
Attemped to precache unknown particle system “blood_impact_antlion_worker”!
Requesting 11 lua files from the server
ConVarRef wire_expression2_file_max_size doesn’t point to an existing ConVar
ConVarRef wire_expression2_quotatick doesn’t point to an existing ConVar
ConVarRef wire_expression2_quotahard doesn’t point to an existing ConVar
ConVarRef wire_expression2_quotasoft doesn’t point to an existing ConVar
ConVarRef wire_expression2_unlimited doesn’t point to an existing ConVar
Netchannel: unknown net message (45) from 192.223.26.64:27015.

Update your server with -verify_all in the command line. You’re using an outdated engine build.