I am getting an error TCP 10061 C#

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C#

Hello, I am doing a chat in C# and I got this error

System.ServiceModel.EndpointNotFoundException: Could not connect to http://localhost:9000/MyService. TCP error code 10061: No connection could be made because the target machine actively refused it 127.0.0.1:9000

Can anyone help ?
Thank you.
Here is the config file of server :

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    
    <system.serviceModel>
        <services>
            <service name="ChattingServer.ChattingService">
                <endpoint address="net.tcp://localhost:9000/MyService"
                    binding="netTcpBinding" bindingConfiguration="" name="ChattingServiceEndPoint"
                    contract="ChattingInterfaces.IChattingService" />
            </service>
        </services>
    </system.serviceModel>
</configuration>

And here is for the client side:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
    <system.serviceModel>
        <client>
            <endpoint address="net.tcp://localhost:9000/MyService"
                binding="netTcpBinding" bindingConfiguration="" contract="ChattingInterfaces.IChattingService"
                name="ChattingServiceEndPoint" kind="" endpointConfiguration="" />
        </client>
    </system.serviceModel>
</configuration>

What I have tried:

I tried by activating the net.tcpListenerAdapter(Start->Service) but nothing happened.