SimpleForceMaterial No Longer Supported

BASIC INFO
Server OS: (How do I check?)
Processor: (...?)
Ram: (...?)
Game(s): Counter-Strike Source
Start Up Command: C:\SRCDS\css\srcds.exe -console -game cstrike -tickrate 33 -ip xxx.xxx.x.x (IPv4) -port 25565 -maxplayers 16 +map de_dust2 -auto update
Admin Mods: None

INSTALLING INFO
Full Install Command: -command update -game "Counter-Strike Source" -dir C:\SRCDS