Error system.security.securityexception webservice (C sharp 2010)

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ASP.NET

Visual-Studio

C#4.0

I have the following error when I try to insert data from a webservice Soap in C sharp, everything is OK when I just try to get data from the webservice by calling a function which normally delivers an XML, but when I call a WS Insert function to insert data This error appears to me

System.Security.SecurityException: Error de solicitud de permiso de tipo 'System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
en System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
en System.Security.CodeAccessPermission.Demand()
en System.Environment.get_MachineName()
en WebServiceSWGateway.Service1.ServiceIngresoCustomerCompany(String CustomerCompanyIDE, String CustomerCompanyName, String CustomerCompanyDir, String CustomerCompanyPhone, String CustomerCompanyCelPhone, String CustomerCompanyEmail, String CustomerCompanyFax, String CustomerCompanyWebSite, Int32 CiudadID, String CustomerCompanyDateIng, Int32 CustomerCompanyState, String CustomerCompanyShortName)

What I have tried:

<system.web>

      <trust level = "Full" />
        <compilation debug="true" >
          <assemblies>
            <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
          </assemblies>
        </compilation>

</system.web>