Hello, i tried another solution : Downloading and installing the last ddn_survey module (04.70.01 RC) from this url
the new error i got :
2016-07-13 15:34:42,789 [aba-PC][Thread:30][ERROR] DotNetNuke.Services.Exceptions.Exceptions - FriendlyMessage="Error: is currently unavailable." ctrl="ASP.desktopmodules_survey_survey_ascx" exc="System.TypeInitializationException: Une exception a été levée par l'initialiseur de type pour 'DotNetNuke.Modules.Survey.DataProvider'. ---> System.InvalidCastException: Impossible d'effectuer un cast d'un objet de type 'DotNetNuke.Modules.Survey.SqlDataProvider' en type 'DotNetNuke.Modules.Survey.DataProvider'.
at DotNetNuke.Modules.Survey.DataProvider.CreateProvider()
at DotNetNuke.Modules.Survey.DataProvider..cctor()
--- End of inner exception stack trace ---
at DotNetNuke.Modules.Survey.DataProvider.Instance()
at DotNetNuke.Modules.Survey.SurveyController.GetSurveys(Int32 ModuleId)
at DotNetNuke.Modules.Survey.survey.DisplaySurvey()
at DotNetNuke.Modules.Survey.survey.DisplaySurveyPage()
at DotNetNuke.Modules.Survey.survey.Page_Load(Object sender, EventArgs e)"
can someone help me or have an idea how fiwing this error ?
thanks a lot