Error: System.NullReferenceException: Object reference not set to an instance of an object.
   at OWExpress.commands.SignIn(HttpContext context) in D:\VisualStudio\TFS2018\Data Stampa\Produzione\DATA STAMPA\WEB\OwEspressWS_Luglio2022\OWExpress\commands.ashx.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Error: System.NullReferenceException: Object reference not set to an instance of an object.
   at OWExpress.commands.SignIn(HttpContext context) in D:\VisualStudio\TFS2018\Data Stampa\Produzione\DATA STAMPA\WEB\OwEspressWS_Luglio2022\OWExpress\commands.ashx.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Error: System.NullReferenceException: Object reference not set to an instance of an object.
   at OWExpress.commands.SignIn(HttpContext context) in D:\VisualStudio\TFS2018\Data Stampa\Produzione\DATA STAMPA\WEB\OwEspressWS_Luglio2022\OWExpress\commands.ashx.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Error: System.NullReferenceException: Object reference not set to an instance of an object.
   at OWExpress.commands.SignIn(HttpContext context) in D:\VisualStudio\TFS2018\Data Stampa\Produzione\DATA STAMPA\WEB\OwEspressWS_Luglio2022\OWExpress\commands.ashx.cs:line 0
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)