Hi,

My setup is:

• Umbraco 7.1.6
• Contour 3.0.23

I'm trying to build a codefirst form that contains conditions. I'll post the code below. When I build and run the site I get the following error:

Sequence contains no matching element

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Sequence contains no matching element

Stack Trace: 
[InvalidOperationException: Sequence contains no matching element]
   System.Linq.Enumerable.Single(IEnumerable`1 source, Func`2 predicate) +2614017
   Umbraco.Forms.CodeFirst.FormManager.SynchronizeForm(Type typeForm) in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\FormBuilder\FormManager.cs:501
   Umbraco.Forms.CodeFirst.FormManager.SynchronizeForms() in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\FormBuilder\FormManager.cs:201
   Umbraco.Forms.CodeFirst.FormManager.Synchronize() in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\FormBuilder\FormManager.cs:24
   Umbraco.Forms.CodeFirst.UmbracoManager.Synchronize() in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\UmbracoManager.cs:36
   Umbraco.Forms.CodeFirst.UmbracoManager.SynchronizeIfNotSynchronized() in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\UmbracoManager.cs:21
   Umbraco.Forms.CodeFirst.ContourFormBuilderHttpModule.context_BeginRequest(Object sender, EventArgs e) in f:\TeamCity\buildAgent\work\3b0e3c3a4846294b\Umbraco.Forms.CodeFirst\ContourFormBuilderHttpModule.cs:27
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +136
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237

When I look in the database (SqlCE) I see that the table UFFieldsets has duplicate entries for my form's fieldset. And the table UFFields has duplicate entries for each of the form's fields.

What is going on and how can I fix it?

Here is my codefirst form:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Umbraco.Forms.CodeFirst;
using Umbraco.Forms.Core;
using Umbraco.Forms.Core.Providers;
using Umbraco.Forms.Core.Providers.FieldTypes;

namespace WebApplication1.App_Code.AM.SteppedForm
{
    [Form("SteppedForm", Id = "59d7c262-76b4-40be-bf10-fc1a4995376b",
        ShowValidationSummary = true,
        MessageOnSubmit = "Thank You!")]
    public class SteppedForm : FormBase
    {
        [Field("ContactILA", "MemberStatus",
            Caption = "Are you a current member?",
            Mandatory = true,
            RequiredErrorMessage = "Are you a current member?",
            Type = typeof(RadioButtonList),
            Prevalues = new string[2] { "Yes", "No" })]
        public string IsMember { get; set; }

        [Field("ContactILA", "MemberStatus",
            Caption = "Are you interested in membership?",
            Type = typeof(RadioButtonList),
            Prevalues = new string[2] { "Yes", "No" },
            EnableCondition = true,
            ConditionActionType = FieldConditionActionType.Show,
            ConditionLogicType = FieldConditionLogicType.Any)]
        [FieldConditionRule("IsMember", FieldConditionRuleOperator.Is, "No")]
        public string MembershipInterest { get; set; }

        [Field("ContactILA", "MemberStatus",
            Caption = "Member Number",
            EnableCondition = true,
            ConditionActionType = FieldConditionActionType.Show,
            ConditionLogicType = FieldConditionLogicType.Any)]
        [FieldConditionRule("IsMember", FieldConditionRuleOperator.Is, "Yes")]
        public string MemberNumber { get; set; }

        public override IEnumerable<Exception> Validate()
        {
            var e = new List<Exception>();

            if (this.IsMember == "Yes" && string.IsNullOrEmpty(this.MemberNumber))
            {
                e.Add(new Exception("Please enter your member number."));
            }

            return e;
        }
    }
}

Thanks!

chester