c# - using web references -

so been few days learning web references within projects have came across strange problem.

using simple console app did this:

namespace webservices09004961 {     class program     {         static void main(string[] args)         {              {                 convert.converttemperaturesoapclient client =                 new convert.converttemperaturesoapclient();                 while (true)                 {                     console.write("enter temperature in celsius: ");                     double tempc = double.parse(console.readline());                     double tempf = client.converttemp(tempc, convert.temperatureunit.degreecelsius, convert.temperatureunit.degreefahrenheit);                     console.writeline("that " + tempf + " degrees farenheit");                 }             }         }     } } 

i have added in service reference "convert" related link: http://www.webservicex.net/converttemperature.asmx?wsdl

however error:

an endpoint configuration section contract 'convert.converttemperaturesoap' not loaded because more 1 endpoint configuration contract found. please indicate preferred endpoint configuration section name.

is because can have 1 service reference allocated @ 1 time? reason ask because local service reference within same project build still works fine? yet 1 doesnt? (it did when first created it)

or seperate problem?

also limitations on soap?

this errors common when try remove svc reference , add again. check app/web.config file, should have duplicate entries convert.converttemperaturesoap. remove 1 of them , work fine.