What's wrong with the code?

[TextDynasty]

manager.on("newOffer", function(offer) {
	console.log("Incoming offer from " + offer.partner.toString());
	
	//Declining all Trade Holds
	offer.getUserDetails(function(err, me, them) {	
	if (them) {
		if (them.escrowDays > 0) {
		offer.decline();
		console.log("They have trade holds. Declining.");
		client.chatMessage(admin, "User sent a offer with trade hold. Declined.")
		client.addFriend(user);
		setTimeout(function() {client.chatMessage(user, "Sorry. We don't accept offer with trade hold.")}, 10000);
	}}
});
	
	var Rkey = 0
	var Gkey = 0
	var Gmetal = 0
	var Rmetal = 0
	
	var user = offer.partner.getSteam3RenderedID()
	var admin = "76561198302774490"
	
	offer.itemsToReceive.forEach(function(item) {
		if (item.name == "Mann Co. Supply Crate Key"){
			return Rkey++
		}
		else if (item.name == "Refined Metal"){
			return Rmetal += 9
		}
		else if (item.name == "Reclaimed Metal"){
			return Rmetal += 3
		}
		else if (item.name == "Scrap Metal"){
			return Rmetal++
		}}
	);
	
	offer.itemsToGive.forEach(function(item) {
		if (item.name == "Mann Co. Supply Crate Key"){
			return Gkey++
		}
		else if (item.name == "Refined Metal"){
			return Gmetal += 9
		}
		else if (item.name == "Reclaimed Metal"){
			return Gmetal += 3
		}
		else if (item.name == "Scrap Metal"){
			return Gmetal++
		}
	});
	
	var onlyGKeys = (offer.itemsToGive.every(function(item) {
		return item.name == "Mann Co. Supply Crate Key";
	}));
	
	var onlyRKeys = (offer.itemsToReceive.every(function(item) {
		return item.name == "Mann Co. Supply Crate Key";
	}));
		
	//sell key
	if (onlyGKeys) {
		if (Rmetal === Gkey * sellkeyprice) {
		offer.accept(function(err) {
		if (err) 
			console.log(err);
		else 
			console.log("Sold " + Gkey + " Keys.");
			console.log("Amount Correct! Accepting the trade offer.");
			if (Gkey > 0) {
			client.chatMessage(admin, "Sold " + Gkey + " Mann Co. Supply Keys.");
			}
			setTimeout(function() {client.chatMessage(user, "Thanks for using. http://steamcommunity.com/id/111111111")}, 5000);
		});
	}
	else {
		offer.decline(function(err) {
			if (err)
				console.log(err);
				else 
					console.log("Trade offer not validated. Declining");
					client.chatMessage(admin, "They are buying it for " + Rmetal + " Scrap Metal.");
					client.addFriend(user);
					setTimeout(function() {client.chatMessage(user, "Your offer is incorrect. Please check it again or resent it later.")}, 10000);
		});
	}}
	
	//buy key
	if (onlyRKeys) {
		if (Gmetal === Rkey * buykeyprice) {
		offer.accept(function(err) {
		if (err) 
			console.log(err);
		else 
			console.log("Bought " + Rkey + " Keys.");
			console.log("Amount Correct! Accepting the trade offer.");
			if (Rkey > 0) {
			client.chatMessage(admin, "Bought " + Rkey + " Mann Co. Supply Keys.");
			}
			setTimeout(function() {client.chatMessage(user, "Thanks for using. http://steamcommunity.com/id/11111111")}, 5000);
		});
	}
	
	else {
		offer.decline(function(err) {
			if (err) console.log(err);
				else 
					console.log("Trade offer not validated. Declining");
					client.chatMessage(admin, "They are selling it for " + Gmetal + " Scrap Metal.");
					client.addFriend(user);
					setTimeout(function() {client.chatMessage(user, "Your offer is incorrect. Please check it again or resent it later.")}, 15000);
		});
	}}
	
	//other offers will be declined
	else {
		offer.decline(function(err) {
			if (err) 
				console.log(err);
				else 
					console.log("Trade offer not validated. Declining");
					client.chatMessage(admin, "User provided a wrong offer. Declined.");
					client.addFriend(user);
					setTimeout(function() {client.chatMessage(user, "Your offer is incorrect. Please check it again or resent it later.")}, 15000);
		});
	}});

Error:

Trade offer not validated. Declining
{ Error: There was an error accepting this trade offer.  Please try again later. (11)
    at Object.exports.makeAnError (C:\Users\Admin\Desktop\Ashley\node_modules\steam-tradeoffer-manager\lib\helpers.js:17:12)
    at SteamCommunity.manager._community.httpRequestPost (C:\Users\Admin\Desktop\Ashley\node_modules\steam-tradeoffer-manager\lib\classes\TradeOffer.js:485:13)
    at Request._callback (C:\Users\Admin\Desktop\Ashley\node_modules\steamcommunity\components\http.js:67:15)
    at Request.self.callback (C:\Users\Admin\Desktop\Ashley\node_modules\request\request.js:186:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.<anonymous> (C:\Users\Admin\Desktop\Ashley\node_modules\request\request.js:1163:10)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at IncomingMessage.<anonymous> (C:\Users\Admin\Desktop\Ashley\node_modules\request\request.js:1085:12) eresult: 11 }
Amount Correct! Accepting the trade offer.

Anyone can help?

Edited November 19, 2017 by TextDynasty

[Vanilla]

https://steamerrors.com/11

 

From here, probably just another Steam issue

[TextDynasty]

https://steamerrors.com/11

 

From here, probably just another Steam issue

I don't think that is just Steam issue. The onlyRKeys works perfectly, but the onlyGKeys always pop up that message even the amount is correct

[TextDynasty]

Any ideas?