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Facing issue while running feature, specflow in visual studio, build error

I have created a basic feature file and trying to execute my first program. I have installed all mandatory packages through NuGet.
Error received :
Error The "GenerateFeatureFileCodeBehindTask" task failed unexpectedly.
System.Exception: Error when reading project file. ---> System.Configuration.ConfigurationErrorsException: Unrecognized element 'unitTestProvider'.
at System.Configuration.ConfigurationElement.DeserializeElement(XmlReader reader, Boolean serializeCollectionKey)
at System.Configuration.ConfigurationSection.DeserializeSection(XmlReader reader)
at TechTalk.SpecFlow.Configuration.ConfigurationSectionHandler.CreateFromXml(String xmlContent)
at TechTalk.SpecFlow.Configuration.ConfigurationLoader.Load(SpecFlowConfiguration specFlowConfiguration, ISpecFlowConfigurationHolder specFlowConfigurationHolder)
at TechTalk.SpecFlow.Generator.Configuration.GeneratorConfigurationProvider.LoadConfiguration(SpecFlowConfiguration specFlowConfiguration, SpecFlowConfigurationHolder specFlowConfigurationHolder)
at TechTalk.SpecFlow.Generator.Configuration.GeneratorConfigurationProviderExtensions.LoadConfiguration(IGeneratorConfigurationProvider configurationProvider, SpecFlowConfigurationHolder configurationHolder)
at TechTalk.SpecFlow.Generator.Project.ProjectReader.ReadSpecFlowProject(String projectFilePath, String rootNamespace)
--- End of inner exception stack trace ---
at TechTalk.SpecFlow.Generator.Project.ProjectReader.ReadSpecFlowProject(String projectFilePath, String rootNamespace)
at TechTalk.SpecFlow.Generator.Project.MSBuildProjectReader.LoadSpecFlowProjectFromMsBuild(String projectFilePath, String rootNamespace)
at SpecFlow.Tools.MsBuild.Generation.SpecFlowProjectProvider.GetSpecFlowProject()
at SpecFlow.Tools.MsBuild.Generation.GenerateFeatureFileCodeBehindTaskExecutor.Execute()
at SpecFlow.Tools.MsBuild.Generation.GenerateFeatureFileCodeBehindTask.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() specflowFramework
my app.config looks like:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<configSections>
<sectionGroup name="NUnit">
<section name="TestRunner" type="System.Configuration.NameValueSectionHandler" />
</sectionGroup>
<section name="specFlow" type="TechTalk.SpecFlow.Configuration.ConfigurationSectionHandler, TechTalk.SpecFlow" />
</configSections>
<specFlow>
<language feature="en-US" />
<unitTestProvider name="MSTest" />
</specFlow>
</configuration>

The unit test providers are not configured anymore in the app.config with SpecFlow 3. You have to use the appropriate NuGet package. Doc link: https://docs.specflow.org/projects/specflow/en/latest/Guides/UpgradeSpecFlow2To3.html#changes-to-how-unit-test-providers-are-configured
In your case, you have to add the SpecFlow.NUnit package to your project and adjust your app.config to
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<configSections>
<sectionGroup name="NUnit">
<section name="TestRunner" type="System.Configuration.NameValueSectionHandler" />
</sectionGroup>
<section name="specFlow" type="TechTalk.SpecFlow.Configuration.ConfigurationSectionHandler, TechTalk.SpecFlow" />
</configSections>
<specFlow>
<language feature="en-US" />
</specFlow>
</configuration>
The list of the correct NuGet package depending on your unit test runner is: https://docs.specflow.org/projects/specflow/en/latest/Installation/Unit-Test-Providers.html
Full disclosure: I am a developer and maintainer of SpecFlow and SpecFlow+

Which App.config is current?

I'm running Visual Studio 12.0 targeting 4.5. I'm running VS Express. My App.config looks like this:
<configuration>
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="ConfigMgrTest2.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<applicationSettings>
<ConfigMgrTest2.Properties.Settings>
<setting name="exampleAppSetting" serializeAs="String">
<value>example app setting data</value>
</setting>
</ConfigMgrTest2.Properties.Settings>
</applicationSettings>
</configuration>
This allows me to use this syntax to access values:
string value = ConfigMgrTest2.Properties.Default.exampleAppSetting;
It seems from my research that I should have an "appSettings" section in my App.config that uses key-value pairs and looks like this:
<appSettings>
<add key="exampleAppSetting" value="example app setting data"/>
</appSettings>
This would allow me to access values like this:
string key = "exampleAppSetting";
var appSettings = System.Configuration.ConfigurationManager.AppSettings;
string value = appSettings[key];
Using my App.config, any call to the ConfigurationManager.AppSettings property is obviously returning null.
The question is, Which version of App.config is "right"?

Both are right and current.
In your example,
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="ConfigMgrTest2.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
You have simply used System.Configuration.ApplicationSettingsGroup to define a new configuration group applicationSettings.
if you were to add this to your config file:
<appSettings>
<add key="Alfa" value="42"/>
</appSettings>
You could still retrieve it with:
var alfa = ConfigurationManager.AppSettings["Alfa"];
Update
Full App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="ConfigMgrTest2.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<applicationSettings>
<ConfigMgrTest2.Properties.Settings>
<setting name="exampleAppSetting" serializeAs="String">
<value>example app setting data</value>
</setting>
</ConfigMgrTest2.Properties.Settings>
</applicationSettings>
<appSettings>
<add key="Alfa" value="42"/>
</appSettings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
</configuration>
Personally, I prefer custom configurations, since they allow me to provide for default values, as well as make some mandatory.

I am not sure about which version is proper, which may depend on your actual usage scenario but if you have the posted section in your app.config like below
<appSettings>
<add key="exampleAppSetting" value="example app setting data"/>
</appSettings>
Then you need to access it like below. You need to mention the KEY for which you are trying to get the value.
ConfigurationManager.AppSettings["exampleAppSetting"]

Assuming you have created a desktop application (WinForms or WPF) the App.config file is automatically copied to the output folder alongside with the executable and renamed to YourApplication.exe.config. It is inside this file that you could have the <appSettings> section:
<configuration>
<appSettings>
<add key="exampleAppSetting" value="example app setting data"/>
</appSettings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
</configuration>
and then you will be able to access this value like this:
var appSettings = System.Configuration.ConfigurationManager.AppSettings;
string value = appSettings["exampleAppSetting"];
You might prefer using custom configuration sections when you have some complex config properties. In this case it might make more sense to move them in a separate configuration file and write a custom section.

Split EnterpriseLibrary Block configurations into multiple files

Is it possible to split the configuration for an enterprise library block into multiple files?
For example: I have three assemblies and one hosting project. I want to store the entlib v6 Exception Handling Application Block (EHAB) configuration for each assembly in a separate config file located in the particular assembly.
The hosting project references the three assemblies:
assembly_X
ehabX.config
assembly_Y
ehabY.config
assembly_Z
ehabZ.config
Hosting project
using ehabX.config
using ehabY.config
using ehabZ.config
I already tried the following:
App.config in the hosting project:
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="enterpriseLibrary.ConfigurationSource" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common" requirePermission="true" />
</configSections>
<enterpriseLibrary.ConfigurationSource>
<sources>
<add name="ehabX" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabX.config" />
<add name="ehabY" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabY.config" />
<add name="ehabZ" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabZ.config" />
</sources>
<redirectSections>
<add sourceName="ehabX" name="exceptionHandling" />
<add sourceName="ehabY" name="exceptionHandling" />
<add sourceName="ehabZ" name="exceptionHandling" />
</redirectSections>
</enterpriseLibrary.ConfigurationSource>
</configuration>
ehabX.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"/>
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Swallow NotImplementedException">
<exceptionTypes>
<add type="System.NotImplementedException, mscorlib" postHandlingAction="None" name="NotImplementedException"/>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>
ehabY.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"/>
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Swallow ArgumentException">
<exceptionTypes>
<add type="System.ArgumentException, mscorlib" postHandlingAction="None" name="NotImplementedException"/>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>
The ehabZ.config is omitted.
Using the EHAB with the policy "Swallow NotImplementedException" works fine. But if I try to use the policy "Swallow ArgumentException" defnied in ehabY.config I get this error message:
Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionHandlingException: The policy with name 'Swallow ArgumentException' cannot be found. Exception handling aborted.
Any suggestions?

Unfortunately, there is nothing out of the box that will let you merge multiple configuration sources into one configuration set.
I think you can probably do what you want but you will have to do some coding. You'll need to read in the appropriate configuration sources and create a custom IConfigurationSource that will merge them all. Additive merge of different config sources? has an example of a MergeConfigurationSource that could help you.

Enterprise Pattern and Practise: configure Sql Azure transient fault Configuration

I am trying to implement SQL Azure Transient Fault Configuration in my ASP.NET application. I am trying to following: http://msdn.microsoft.com/en-us/library/hh680899(v=pandp.50).aspx
Though I didn't find the block on how can I configure this in config file. I am getting The type RetryManager does not have an accessible constructor. error in my code. I read in some forum that I should configure it using config file, but how is my question. Thanks.
EDIT: I am using Enterprise Lib 5.0

Here's a sample configuration:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="RetryPolicyConfiguration" type="Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling.Configuration.RetryPolicyConfigurationSettings, Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling, Version=5.1.1209.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
<section name="typeRegistrationProvidersConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.TypeRegistrationProvidersConfigurationSection, Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<RetryPolicyConfiguration defaultRetryStrategy="Incremental Retry Strategy" defaultSqlConnectionRetryStrategy="Backoff Retry Strategy" defaultSqlCommandRetryStrategy="Incremental Retry Strategy" defaultAzureStorageRetryStrategy="Incremental Retry Strategy" defaultAzureServiceBusRetryStrategy="Fixed Interval Retry Strategy">
<incremental name="Incremental Retry Strategy" retryIncrement="00:00:05" maxRetryCount="5" />
<fixedInterval name="Fixed Interval Retry Strategy" retryInterval="00:00:01" maxRetryCount="10" />
<exponentialBackoff name="Backoff Retry Strategy" minBackoff="00:00:01" maxBackoff="00:00:30" deltaBackoff="00:00:10" maxRetryCount="10" />
</RetryPolicyConfiguration>
<typeRegistrationProvidersConfiguration>
<clear />
<add name="Caching" sectionName="cachingConfiguration" />
<add name="Cryptography" sectionName="securityCryptographyConfiguration" />
<add name="Exception Handling" sectionName="exceptionHandling" />
<add name="Instrumentation" sectionName="instrumentationConfiguration" />
<add name="Logging" sectionName="loggingConfiguration" />
<add name="Policy Injection" sectionName="policyInjection" />
<add name="Security" sectionName="securityConfiguration" />
<add name="Data Access" providerType="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSyntheticConfigSettings, Microsoft.Practices.EnterpriseLibrary.Data" />
<add name="Validation" providerType="Microsoft.Practices.EnterpriseLibrary.Validation.Configuration.ValidationTypeRegistrationProvider, Microsoft.Practices.EnterpriseLibrary.Validation" />
<add sectionName="RetryPolicyConfiguration" name="RetryPolicyConfiguration" />
</typeRegistrationProvidersConfiguration>
<appSettings>
</appSettings>
</configuration>

Configuration system failed to initialise

I have a console application with a config file called app.config. The full code behind by app.config file is as follows:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="ClientSettingsProvider.ServiceUri" value=""/>
<add key="Server" value="0.0.0.0"/>
<add key="DB" value="Test"/>
<add key="UserName" value="testuser"/>
<add key="Password" value="testuser"/>
<add key="AgentEmail" value="test#gmail.com"/>
</appSettings>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup>
</configuration>
When I try to run my application, I get an error : Configuration system failed to initialize. Any idea what am I doing wrong?

Remove the configSections from the file if you don't require it.

You're defining a section group and a contained section in your config here:
<configuration>
<configSections>
<sectionGroup name="applicationSettings"
type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="LeadDataEmail.Properties.Settings"
type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
That means, there must be a <applicationSettings> container, with a contained <LeadDataEmail.Properties.Settings> XML element in your <configuration>:
<configuration>
<configSections>
......
</configSections>
<applicationSettings>
<LeadDataEmail.Properties.Settings
attribute1="value1"
attribute2="value2" />
</applicationSettings>
....
</configuration>
but I don't see any trace of that in your config file - no wonder the config system cannot initialize!