New Gmod Update Broke ULib: Cannot Start Server Need Help

[Tommy Keys]

After the Garry's Mod Update my server cannot start due to the following error and I need help understanding how to fix this:
[ERROR] unable to find CNetChan::IsValidFileForTransfer
  1. unknown - [C]:-1
   2. require - [C]:-1
    3. fn - lua/autorun/server/sv_a2scache.lua:2
     4. unknown - addons/ulib-master/lua/ulib/shared/hook.lua:109

hook.lua
-- Called by the engine
--
function Call( name, gm, ... )
    --
    -- Run hooks
    --
    local HookTable = Hooks[ name ]
    if ( HookTable != nil ) then
        for i=-2, 2 do
            for k, v in pairs( HookTable[ i ] ) do
                if ( v.isstring ) then
                    --
                    -- If it's a string, it's cool
                    --
                    local a, b, c, d, e, f = v.fn( ... ) --Line 109 (Error)
                    if ( a != nil && i > -2 && i < 2 ) then
                        return a, b, c, d, e, f
                    end
                else
--Snipped to save chatacters.
                end
            end
        end
    end
    --
    -- Call the gamemode function
    --
    if ( !gm ) then return end
    local GamemodeFunction = gm[ name ]
    if ( GamemodeFunction == nil ) then return end
    return GamemodeFunction( gm, ... )
end

sv_a2scache.lua
hook.Add('Initialize', 'serversecure initialization', function()
require('serversecure.core') --Line 2 (Error)
serversecure.EnableThreadedSocket(true) -- receives packets from the game socket on another thread (as well as analyzing it)
serversecure.EnablePacketValidation(true) -- validates packets for having correct types, size, content, etc.
serversecure.EnableInfoCache(true) -- enable A2S_INFO response cache
serversecure.SetInfoCacheTime(5) -- seconds for cache to live (default is 5 seconds)
serversecure.EnableQueryLimiter(false) -- enable query limiter (similar to Source's one but all handled on the same place)
serversecure.SetMaxQueriesWindow(60) -- timespan over which to average query counts from IPs (default is 30 seconds)
serversecure.SetMaxQueriesPerSecond(2) -- maximum queries per second from a single IP (default is 1 per second)
serversecure.SetGlobalMaxQueriesPerSecond(120) -- maximum total queries per second (default is 60 per second)
serversecure.RefreshInfoCache()
print('Loaded A2S Cache')
end)
local highestcount = 0
timer.Create('PlayerStatCache', 10, 0, function()
if serversecure and (#player.GetAll() > highestcount) then
highestcount = #player.GetAll()
print('A2S Cache: buffing stats')
serversecure.RefreshInfoCache()
end
end)

I'm not sure where to look for serversecure.core. I cannot locate it in any includes or module folder. What is going here to prevent the server from starting?
The game update logs are found here:

https://gmod.facepunch.com/blog/october-2018-update/

[bigdogmat]

ULib isn't broken, whatever is using gmsv_serversecure is broken. It's broken because it can't find CNetChan::IsValidFileForTransfer, report it on the github (https://github.com/danielga/gmsv_serversecure).

[G😹nz😻]

What about if you take that as2 module out from your server, it's your host who needs to fix this, not you

[Tommy Keys]

I've commented out sv_a2scache.lua and restarted the server successfully. There seems to be an update to A2S available from the host now.

Thanks to the both of you for the help.