Error on calling OperationContract in WCF Service

I need some help to find the solution. I deployed my WCF Service on a server. Local it worked just fine. But on the server I get an error invoking one of the operations first operation works fine.

Here the error:

The server was unable to process the request due to an internal error.  For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at IService.createInstallation()
   at ServiceClient.createInstallation()

public class Service : IService
    {
        private CustomerConfiguration custConfig;
        
        /// <summary>
        /// Method generates a request
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public string createRequest(string request)
        {
            string response = "";

            Request req = new Request();
           custConfig = req.validate(request);

            //Return response
            if (custConfig.mode != 9)
            {
                response = "0";
            }
            else
            {
                response = custConfig.error;
            }

            return response;
        }

        /// <summary>
        /// Method initializes the installation
        /// process
        /// </summary>
        /// <param name="custConfig"></param>
        public void createInstallation()
        {
            Installation inst = new Installation();
            inst.init(custConfig);

            
        }

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