I get lod of these error messages. Help please. Really appreciate it. :D
Error: Material "models/weapons/c_items/c_rocketboots_demo" : proxy "AnimatedWeaponSheen" unable to initialize!
Error: Material "models/weapons/c_items/c_rocketboots_demo" : proxy "AnimatedWeaponSheen" unable to initialize!

Attemped to precache unknown particle system "bot_recent_teleport_blue"!
Attemped to precache unknown particle system "fireSmoke_Collumn_mvmAcres"!
Attemped to precache unknown particle system "fireSmoke_Collumn_mvmAcres_sm"!
Attemped to precache unknown particle system "unusual_aaa_aaa"!
Attemped to precache unknown particle system "medic_resist_bullet"!
Attemped to precache unknown particle system "medic_resist_blast"!
Attemped to precache unknown particle system "medic_resist_fire"!
Attemped to precache unknown particle system "medic_resist_match_bullet_red"!
Attemped to precache unknown particle system "medic_resist_match_blast_red"!
Attemped to precache unknown particle system "medic_resist_match_fire_red"!
Attemped to precache unknown particle system "medic_resist_match_blast_blue"!
Attemped to precache unknown particle system "medic_resist_match_bullet_blue"!
Attemped to precache unknown particle system "medic_resist_match_fire_blue"!
Attemped to precache unknown particle system "eyeboss_vortex_blue"!
Attemped to precache unknown particle system "eyeboss_vortex_red"!
Attemped to precache unknown particle system "eyeboss_team_blue"!
Attemped to precache unknown particle system "eyeboss_team_sparks"!
Attemped to precache unknown particle system "eyeboss_team_red"!
Attemped to precache unknown particle system "eyeboss_team_sparks_red"!
The server is using sv_pure 0. (Enforcing consistency for select files only)
No such variable "$sheenmapmaskscaleX" for material "models/weapons/v_machete/v_machete"
Error: Material "models/weapons/v_machete/v_machete" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/v_shovel/v_shovel"
Error: Material "models/weapons/v_shovel/v_shovel" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/c_items/c_smg"
Error: Material "models/weapons/c_items/c_smg" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/c_items/c_smg_gold"
Error: Material "models/weapons/c_items/c_smg_gold" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/v_pistol/v_pistol"
Error: Material "models/weapons/v_pistol/v_pistol" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/c_items/c_sapper"
Error: Material "models/weapons/c_items/c_sapper" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/v_sapper/v_sapper_glass"
Error: Material "models/weapons/v_sapper/v_sapper_glass" : proxy "AnimatedWeaponSheen" unable to initialize!
No such variable "$sheenmapmaskscaleX" for material "models/weapons/c_items/c_natasha"

^(I get shitload of these, like loads)^

model props_badlands\barrel01.mdl used as a static prop, but not compiled as a static prop
model props_badlands\barrel03.mdl used as a static prop, but not compiled as a static prop
model props_badlands\barrel02.mdl used as a static prop, but not compiled as a static prop

model props_badlands\Quarry_rockPike.mdl used as a static prop, but not compiled as a static prop

Blocking HTML info panel 'http://motd.pinion.gg/motd/blackoutgaming/tf2/motd.html?ip=81.19.217.196&po=27165&si=STEAM_0:0:50477487&pv=1.12.24a&tr=1'; Using plaintext instead.
Blocking HTML info panel 'http://motd.pinion.gg/motd/blackoutgaming/tf2/motd.html?ip=81.19.217.196&po=27165&si=STEAM_0:0:50477487&pv=1.12.24a&tr=1'; Using plaintext instead.
Blocking MOTD URL ''; must begin with 'http://' or 'https://' or be about:blank

*** Encountered VTF file with an invalid minor version!
*** Encountered VTF file with an invalid full header!
Error reading texture header "materials/vgui/resource/mic_meter_dead.vtf"
*** Encountered VTF file with an invalid minor version!
*** Encountered VTF file with an invalid full header!
Error reading texture header "materials/vgui/resource/mic_meter_live.vtf"

Error: Material "models/weapons/c_items/c_rocketboots_demo" : proxy "AnimatedWeaponSheen" unable to initialize!
Error: Material "models/weapons/c_items/c_rocketboots_demo" : proxy "AnimatedWeaponSheen" unable to initialize!

How would I turn off the option allowing custom files to be downloaded?
Is it in game or in the steam settings?

Some more error messages guys can you please help?

Cannot update control point 0 for effect 'laser_sight_beam'.

Cannot update control point 7 for effect 'cig_smoke'

Failed to load sound "quake\hjker\humiliation.mp3", file probably missing from disk/repository
Failed to load sound "quake\hjker\humiliation.mp3", file probably missing from disk/repository
Failed to find attachment point specified for particle effect in model '(null)' keyvalues section. Trying to spawn effect 'cig_smoke' on attachment named 'prp_cig'

Ok thanks guys

I get some error messages in the console when I open TF2. Can anyone please tell me if they are the things causing m game to lag and if so how to fix them?

KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file resource/ClientScheme.res
Scheme, (*CustomFontFiles*), (*14*), (*name*), (*turkish*), (*range*), (*1*),
Couldn't find custom font file 'resource/Cerbetica_bold_medic.otf'
Couldn't parse script sequence 'DamagedPlayer': expected <anim command>, found '0.0'

Couldn't parse script sequence 'DamagedPlayer': expected <anim command>, found '0.0'
Failed to load data from file, "20140612-102354-cp_orange_x3_cod.dmx"

Couldn't parse script sequence 'DamagedPlayer': expected <anim command>, found '0.0'