Помогите с плагином!

#include <amxmodx>
#include <amxmisc>

public plugin_init() {
    register_plugin("111","2.2.2","333")
    register_concmd("amx_gravity","set_gravity",ADMIN_CVAR, "<gravity>")
}

public set_gravity(id, level, cid) {
    if(!cmd_access(id,level,cid,3))
        return PLUGIN_HANDLED
    
    new GravityStr[16]
    read_argv(1,GravityStr,15)
    
    if(is_str_num(GravityStr)) {
        new name[32]
        get_user_name(id,name,31)
        new num = str_to_num(GravityStr)
        set_cvar_num("sv_gravity",num)
        if(get_cvar_num("amx_show_activity") == 1)
            client_print(0,print_chat,"[AMXX]Admin changed gravity to %d",num)
        else if(get_cvar_num("amx_show_activity") == 2)
            client_print(0,print_chat,"[AMXX]%s changed gravity to %d",name,num)
    }
    else
        client_print(id,print_console,"[AMXX]Gravity must be a number")
    
    return PLUGIN_HANDLED
}