lol by the look of your gun color and the ghost right below the error, yup your hacking. tell me which hacks you turned on, then ill see what i can do. you cant say you dont hack, i could tell by the screen your hacking. The ghost says it all.
For ex: 1 hit, fly, speed hack, no reload, fast knife, defuse hack, and sometimes aimbotting gives you client errors..(idk which numbers but they do i've tried them.).
Turn off those things you have, wallhack doesnt do any thing. turn off those and you'll be fine.
Or just re-install crossfire
BTW, as you've said about people not getting the errors when having the same features, well they have vip, meaning they paid for it with real money. If you didnt, then there you go. VIP hacks dont cause errors.