How to get less client errors?

So I'm using Sa3eed's hacks and i commonly play Zombie mode, and i need knife there but i always get errors!!!! even if i limit them down and play with guns and use knife only when theres quite a lot of zombies, i still get Errors, is there anyway to get less errors? anything to download or to do? give me anytips so i can stop getting this many errors

Can't really fix it yourself, I have the same thing with his hack.only person who can fix it is saeed himself, he did something wrong in the coding even though he said he fixed the error for the past 4 hacks he made.