Spaning Tree Protocol

[SOD]

Hi all, I am using the STP protocol with a ring topology with three switch and two computers are connected to transmit a TCPApp. View Image STP1. 

If I make the first example with the three switches connected in a ring (as STP1 picture), I look at the packets with wireshark and only the first des of the client sends. And I jump error, see error image. So I think I haven't properly configured the STP. 

And if I do the three swicthes without closing the ring as in NoProblem image with wireshark I can see all tcp packets s'envian and entirely correct. No mistake. 

How i can configure STP for work fine my topology?

Under the code. Thank you very much for your help. Using the 2.3 version of INET.

Code:

package new2;

import inet.networklayer.autorouting.ipv4.IPv4NetworkConfigurator;

import inet.nodes.ethernet.EtherSwitch;

import inet.nodes.inet.StandardHost;

import inet.util.NetAnimTrace;

import ned.DatarateChannel;

network NewPcapRecorderTest2

{

    @display("bgb=482,392");

    types:

        channel C extends DatarateChannel

        {

            datarate = 10Mbps;

            //delay = 0.1us;

        }

    submodules:

        client1: StandardHost {

            parameters:

                @display("p=97,284;i=device/pc3");

        }

        server: StandardHost {

            parameters:

                @display("p=416,178;i=device/pc2");

        }

        configurator: IPv4NetworkConfigurator {

            parameters:

                @display("p=46,28");

        }

        netAnimTrace: NetAnimTrace {

            @display("p=46,105");

        }

        etherSwitch: EtherSwitch {

            csmacdSupport = false;

            spanningTreeProtocol = "";

            hasStatus = true;

            @display("p=226,223");

        }

        etherSwitch2: EtherSwitch {

            csmacdSupport = false;

            spanningTreeProtocol = "";

            hasStatus = true;

            @display("p=297,155");

        }

        etherSwitch1: EtherSwitch {

            csmacdSupport = false;

            spanningTreeProtocol = "";

            hasStatus = true;

            @display("p=324,231");

        }

    connections:

        client1.ethg++ <--> C <--> etherSwitch.ethg++;

        etherSwitch.ethg++ <--> C <--> etherSwitch2.ethg++;

        etherSwitch2.ethg++ <--> C <--> server.ethg++;

        etherSwitch.ethg++ <--> C <--> etherSwitch1.ethg++;

        etherSwitch2.ethg++ <--> C <--> etherSwitch1.ethg++;

}

[Anukul Mohil]

EtherSwitches don't implement Spanning Tree Protocol by default so are you writing the PROTOCOL ??