Entity-framework – Add-Migration: The type initializer for ‘System.Net.ServicePointManager’ threw an exception

I'm trying to do an Entity Framework code-first migration in an Azure Mobile Service. I have the project running locally and add this new class to my model:

using Microsoft.WindowsAzure.Mobile.Service;
using System;

namespace VCollectAPI.DataObjects
{
    public class TagEdit : EntityData
    {
        public string EditedTagId { get; set; }
        public string SourceTagName { get; set; }
        public string ResultingTagName { get; set; }
        public DateTime TimeOfEdit { get; set; }
    }
}

I also add this property to my VCollectAPIContext:DbContext class

public DbSet<TagEdit> TagEdits { get; set; }

and add a line to my TagDomainManager:EntityDomainManager class

if (changedItems.Contains("Name"))
{
    _context.TagEdits.Add(new TagEdit { EditedTagId = current.Id, SourceTagName = current.Name, ResultingTagName = update.Name, TimeOfEdit = DateTime.UtcNow });
    current.Name = update.Name;
}

At the PMC (Package Manager Console) I then run the command

Add-Migration RecordingTagEdits -Verbose

I expect that to make the migration scaffolding the schema update to add the new table. Instead I get the error "The type initializer for 'System.Net.ServicePointManager' threw an exception."

What am I doing wrong and how do I fix it?

The full error trace is:

System.TypeInitializationException: The type initializer for
'System.Net.ServicePointManager' threw an exception. —>
System.TypeInitializationException: The type initializer for
'System.Net.ComNetOS' threw an exception. —>
System.Configuration.ConfigurationErrorsException: The element
may only appear once in this section.
(C:\TFS\HXDMSRC\VisualCollections\Development\VCollectAPI\tmp140.tmp
line 16) at
System.Configuration.BaseConfigurationRecord.EvaluateOne(String[]
keys, SectionInput input, Boolean isTrusted, FactoryRecord
factoryRecord, SectionRecord sectionRecord, Object parentResult) at
System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord
factoryRecord, SectionRecord sectionRecord, Object parentResult,
Boolean getLkg, Boolean getRuntimeObject, Object& result, Object&
resultRuntimeObject) at
System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
configKey, Boolean getLkg, Boolean checkPermission, Boolean
getRuntimeObject, Boolean requestIsHere, Object& result, Object&
resultRuntimeObject) at
System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
configKey, Boolean getLkg, Boolean checkPermission, Boolean
getRuntimeObject, Boolean requestIsHere, Object& result, Object&
resultRuntimeObject) at
System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
configKey, Boolean getLkg, Boolean checkPermission, Boolean
getRuntimeObject, Boolean requestIsHere, Object& result, Object&
resultRuntimeObject) at
System.Configuration.BaseConfigurationRecord.GetSection(String
configKey) at
System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String
sectionName) at
System.Configuration.ConfigurationManager.GetSection(String
sectionName) at
System.Configuration.PrivilegedConfigurationManager.GetSection(String
sectionName) at
System.Diagnostics.DiagnosticsConfiguration.Initialize() at
System.Diagnostics.DiagnosticsConfiguration.get_Sources() at
System.Diagnostics.TraceSource.Initialize() at
System.Net.Logging.InitializeLogging() at
System.Net.Logging.get_On() at System.Net.ComNetOS..cctor() —
End of inner exception stack trace — at
System.Net.ServicePointManager..cctor() — End of inner exception
stack trace — at
System.Net.ServicePointManager.EnsureStrongCryptoSettingsInitialized()
at
Microsoft.VisualStudio.Platform.VsAppDomainManager.InitializeNewDomain(AppDomainSetup
appDomainInfo) at System.AppDomain.CreateAppDomainManager() at
System.AppDomain.Setup(Object arg) at
System.AppDomain.nCreateDomain(String friendlyName, AppDomainSetup
setup, Evidence providedSecurityInfo, Evidence creatorsSecurityInfo,
IntPtr parentSecurityDescriptor) at
System.AppDomainManager.CreateDomainHelper(String friendlyName,
Evidence securityInfo, AppDomainSetup appDomainInfo) at
System.AppDomainManager.CreateDomain(String friendlyName, Evidence
securityInfo, AppDomainSetup appDomainInfo) at
System.AppDomain.InternalCreateDomain(String friendlyName, Evidence
securityInfo, AppDomainSetup info) at
System.AppDomain.CreateDomain(String friendlyName, Evidence
securityInfo, AppDomainSetup info) at
System.Data.Entity.Migrations.Design.ToolingFacade..ctor(String
migrationsAssemblyName, String contextAssemblyName, String
configurationTypeName, String workingDirectory, String
configurationFilePath, String dataDirectory, DbConnectionInfo
connectionStringInfo) at
System.Data.Entity.Migrations.MigrationsDomainCommand.GetFacade(String
configurationTypeName, Boolean useContextWorkingDirectory) at
System.Data.Entity.Migrations.AddMigrationCommand.Execute(String name,
Boolean force, Boolean ignoreChanges) at
System.Data.Entity.Migrations.AddMigrationCommand.<>c__DisplayClass2.<.ctor>b__0()
at
System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action
command) The type initializer for 'System.Net.ServicePointManager'
threw an exception.