"Stalker" gamemode throwing a PREP FAILED error on server startup, file incompatibility?

I am attempting to run the gamemode “The Stalker” on my server that is being hosted elsewhere (i.e I have no physical access to it)

Starting my server with my custom commandline yields this:


Fetching Workshop Addons..
Calling GetCollectionDetails
Collection has 3 Addons
Mounting Addon 'Auto-Cleaning Decals [No ULX and more admins mod]' (412608410)
Mounting Addon 'Hit Numbers' (110871780)
Mounting Addon 'The Stalker' (114017878)
Adding Filesystem Addon 'c:	cafiles\users	hanea\6779\garrysmod\addons\ulib-master'
Adding Filesystem Addon 'c:	cafiles\users	hanea\6779\garrysmod\addons\ulx-master'
Changing gamemode to The Stalker (stalker)
WARNING: Port 27005 was unavailable - bound to port 27007 instead
Network: IP 192.99.44.67, mode MP, dedicated Yes, ports 27015 SV / 27007 CL
Incompatible pack file detected! 
PREP FAILED[(null)]
Incompatible pack file detected! 
PREP FAILED[$��jp�j�-z]
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
Bad overlay basis at (0.000000 0.000000 0.000000)!
[AddCSLuaFile] Couldn't find 'base/gamemode/cl_init.lua' (<nowhere>)
Couldn't include file 'base\gamemode\init.lua' (File not found) (<nowhere>)
Couldn't Load Init Script: 'base/gamemode/init.lua'
///////////////////////////////
//      Ulysses Library      //
///////////////////////////////
// Loading...                //
//  shared/defines.lua       //
//  shared/misc.lua          //
//  shared/util.lua          //
//  shared/hook.lua          //
//  shared/table.lua         //
//  shared/player.lua        //
//  server/player.lua        //
//  shared/messages.lua      //
//  shared/commands.lua      //
//  server/concommand.lua    //
//  server/util.lua          //
//  shared/sh_ucl.lua        //
//  server/ucl.lua           //
//  server/phys.lua          //
//  server/player_ext.lua    //
//  server/entity_ext.lua    //
//  shared/plugin.lua        //
//  shared/cami_global.lua   //
//  shared/cami_ulib.lua     //
// Load Complete!            //
///////////////////////////////
[ULIB] Loading SHARED module: ulx_init.lua
///////////////////////////////
//       ULX Admin Mod       //
///////////////////////////////
// Loading...                //
//  sh_defines.lua           //
//  lib.lua                  //
//  base.lua                 //
//  sh_base.lua              //
//  log.lua                  //
//  MODULE: slots.lua        //
//  MODULE: uteam.lua        //
//  MODULE: votemap.lua      //
//  MODULE: xgui_server.lua  //
///////////////////////////////
// ULX GUI -- by Stickly Man //
///////////////////////////////
// Adding Main Modules..     //
//  bans.lua                 //
//  commands.lua             //
//  groups.lua               //
//  maps.lua                 //
//  settings.lua             //
// Adding Setting Modules..  //
//  client.lua               //
//  server.lua               //
// Adding Gamemode Modules.. //
//  sandbox.lua              //
// Loading Server Modules..  //
//  sv_bans.lua              //
//  sv_groups.lua            //
//  sv_maps.lua              //
//  sv_sandbox.lua           //
//  sv_settings.lua          //
// XGUI modules added!       //
///////////////////////////////
//  MODULE: chat.lua         //
//  MODULE: fun.lua          //
//  MODULE: menus.lua        //
//  MODULE: rcon.lua         //
//  MODULE: teleport.lua     //
//  MODULE: user.lua         //
//  MODULE: userhelp.lua     //
//  MODULE: util.lua         //
//  MODULE: vote.lua         //
//  end.lua                  //
// Load Complete!            //
///////////////////////////////
[ACD] Successfully initialize.
-- Hit Numbers loaded --
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (weapon_stalker) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (weapon_fists) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (weapon_medkit) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (weapon_flechettegun) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
SWEP (ts_base) is derived from non existant SWEP (weapon_base) - Expect errors!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity sent_scanner from non existant entity base_anim!
ERROR: Trying to derive entity sent_ball from non existant entity base_anim!
ERROR: Trying to derive entity sent_healing from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity sent_tripmine from non existant entity base_anim!
ERROR: Trying to derive entity sent_tripmine_laser from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity sent_giblet from non existant entity base_anim!
ERROR: Trying to derive entity sent_flashlight from non existant entity base_anim!
ERROR: Trying to derive entity info_player_stalker from non existant entity base_point!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity sent_seeker from non existant entity base_anim!
ERROR: Trying to derive entity sent_droppedgun from non existant entity base_anim!
ERROR: Trying to derive entity widget_base from non existant entity base_anim!
ERROR: Trying to derive entity info_player_human from non existant entity base_point!
ERROR: Trying to derive entity sent_tele from non existant entity base_anim!
[AddCSLuaFile] Couldn't find 'effects/base.lua' (<nowhere>)
HTTP failed - ISteamHTTP isn't available!
Making workshop map available for client download

The commandline I am running is:

-norestart -console -game garrysmod -nohltv -condebug -tickrate 66 +gamemode stalker +maxplayers 32 +ip 192.99.44.67 -port 27015 +map “ts_annex” +fps_max 66 +host_workshop_collection [CENSORED] -authkey [CENSORED] +rcon_password [CENSORED]

The map is the problem. Could be from an unsupported game.