Hello, I had trouble setting up a dedicated server.
So I started my server up, set everything up, mods installed on both my client and the server.

When I joined the server, the textures are all missing and when I check the command console, it says "Unknown material variable type for copy" in red.

Here's the startup file content :
"start srcds_x64.exe -console -workshop -port 27016 -usercon -game doi -maxplayers 40 +sv_lan 0 +map "nimy stronghold" +servercfgfile "server_coopSS" +sv_pure -1 +mp_theater_override ScreamingSteel"

here's the subscribed_file_ids.txt content :
1455070029
1454108722
1095516761
1170130416
1170132122
1170133655
1390091959

here's the server.cfg command content :
sv_lan 0
sv_playlist ww1/coop
sv_pure -1
mp_theater_override ScreamingSteel
sv_hud_deathmessages 1
doi_bot_count_override 1
doi_bot_count_default_enemy_max_players 25
doi_bot_count_default_enemy_min_players 25
doi_bot_count_default_friendly_max_players 15
doi_bot_count_default_friendly_min_players 15
spec_allow_bots 1

Any help would be appreciated, thanks!