Exception of type 'Microsoft.SharePoint.SoapServer.SoapServerException' was thrown

i m using sharepoint webservice admin.asmx to create a site collection in my webapp using following method

adminService.Creat开发者_如何学JAVAeSite(fullUrl, siteName, string.Empty, LCID, SITE_TEMPLATE, loginName, displayName, string.Empty, string.Empty, string.Empty);

adminService is object of this service

Make sure that you are giving the sharepoint administrator credential to the webservice before calling the adminService.CreateSite...