Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card can only be activated at the start of Main Phase 1, and only if you control no face-up Synchro Monsters. Neither player can Special Summon a Synchro Monster until your opponent's next End Phase.
--完全防音壁
--Soundproofed
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.cfilter(c)
	return c:IsFaceup() and c:IsType(TYPE_SYNCHRO)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsPhase(PHASE_MAIN1) and not Duel.CheckPhaseActivity()
		and not Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_SPECIAL_SUMMON)
	e1:SetDescription(aux.Stringid(id,1))
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_CLIENT_HINT)
	e1:SetTargetRange(1,1)
	e1:SetTarget(s.sumlimit)
	e1:SetReset(RESET_PHASE|PHASE_END,2)
	Duel.RegisterEffect(e1,tp)
end
function s.sumlimit(e,c,sump,sumtype,sumpos,targetp)
	return c:IsType(TYPE_SYNCHRO)
end