An unhandled exception of type System TypeInitializationException occurred in EntityFramework dll

Question

I was trying to learn Entity Framework and SQLite using this tutorial  However  I get an error   The error thrown is      An unhandled exception of type  System TypeInitializationException  occurred in EntityFramework dll      Additional information  The type initializer for  System Data Entity Internal AppConfig  threw an exception    Here is the full error trace   System TypeInitializationException  The type initializer for  System Data Entity Internal AppConfig  threw an exception  --- gt  System Configuration Configuration ErrorsException  Configuration system failed to initialize --- gt  System Configuration ConfigurationErrorsException  Only one  lt configSections gt  element allowed per config file and if present must be the first child of the root  lt configuration gt  element   C  Users Ankur Documents Visual Studio 2012 Projects ConsoleApplication1 ConsoleApplication1 bin Debug ConsoleApplication1 vshost exe config line 11     at System Configuration ConfigurationSchemaErrors ThrowIfErrors Boolean ignoreLocal     at System Configuration BaseConfigurationRecord ThrowIfParseErrors ConfigurationSchemaErrors schemaErrors     at System Configuration BaseConfigurationRecord ThrowIfInitErrors      at System Configuration ClientConfigurationSystem EnsureInit String configKey     --- End of inner exception stack trace ---    at System Configuration ClientConfigurationSystem EnsureInit String configKey     at System Configuration ClientConfigurationSystem PrepareClientConfigSystem String sectionName     at System Configuration ClientConfigurationSystem System Configuration Internal IInternalConfigSystem GetSection String sectionName     at System Configuration ConfigurationManager get ConnectionStrings      at System Data Entity Internal AppConfig  ctor      at System Data Entity Internal AppConfig  cctor      --- End of inner exception stack trace ---    at System Data Entity Internal AppConfig get DefaultInstance      at System Data Entity Internal LazyInternalConnection  ctor String nameOrConnectionString     at System Data Entity DbContext  ctor      at ConsoleApplication1 ChinookContext  ctor      at ConsoleApplication1 Program Main String   args  in c  Users Ankur Documents Visual Studio 2012 Projects ConsoleApplication1 ConsoleApplication1 Program cs  line 16   Here is the C  code   namespace ConsoleApplication1       class Program               static void Main string   args                        using  var context   new ChinookContext      error comes on this line                                                  class ChinookContext   DbContext                 Here is file App config    lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt     lt system data gt       lt DbProviderFactories gt         lt add name  SQLite Data Provider  invariant  System Data SQLite  description  Data Provider for SQLite  type  System Data SQLite SQLiteFactory  System Data SQLite    gt       lt  DbProviderFactories gt     lt  system data gt     lt connectionStrings gt       lt add name  ChinookContext  connectionString  Data Source  DataDirectory Chinook Sqlite AutoIncrementPKs sqlite  providerName  System Data SQLite    gt     lt  connectionStrings gt     lt configSections gt       lt section name  entityFramework  type  System Data Entity Internal ConfigFile EntityFrameworkSection  EntityFramework  Version 5 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  requirePermission  false    gt       lt  -- For more information on Entity Framework configuration  visit http   go microsoft com fwlink  LinkID 237468 -- gt     lt  configSections gt     lt startup gt       lt supportedRuntime version  v4 0  sku   NETFramework Version v4 5    gt     lt  startup gt     lt entityFramework gt       lt defaultConnectionFactory type  System Data Entity Infrastructure LocalDbConnectionFactory  EntityFramework  gt         lt parameters gt           lt parameter value  v11 0    gt         lt  parameters gt       lt  defaultConnectionFactory gt     lt  entityFramework gt   lt  configuration gt    Here is file packages config    lt  xml version  1 0  encoding  utf-8   gt   lt packages gt     lt package id  EntityFramework  version  5 0 0  targetFramework  net45    gt     lt package id  System Data SQLite x86  version  1 0 86 0  targetFramework  net45    gt   lt  packages gt

User · Answer

I had this issue when i refereed a library project from a console application, and the library project was using a nuget package which is not refereed in the console application. Referring the same package in the console application helped to resolve this issue.

Seeing the Inner exception can help.

User · Answer

Check that right version is referenced in your project  E g  the dll it is complaining about  could be from an older version and that s why there could be a version mismatch

User · Answer

Just go to Web Config from Main folder  not the one in Views Folder   configSections  section name  entityFramework  type  System Data        Version    lt strong gt 5 lt  strong gt  0 0 0      lt      ADJUST THE VERSION OF EntityFramework you have installed  ex  like Version 6 0 0 0

User · Answer

In static class  if you are getting information from xml or reg  class tries to initialize all properties  therefore  you should control if the config variable is there otherwise properties will not initialize so the class   Check xml referance variable is there  Check reg referance variable is is there  Make sure you handle if they are not there

User · Answer

Check which version of Entity Framework reference you have in your References and make sure that it matches with your configSections node in Web config file  In my case it was pointing to version 5 0 0 0 in my configSections and my reference was 6 0 0 0  I just changed it and it worked      lt section name  entityFramework  type  System Data Entity Internal ConfigFile EntityFrameworkSection  EntityFramework  Version 6 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  requirePermission  false   gt

User · Answer

Read the message      Only one  lt configSections gt  element allowed per    config file and if present must be the first child of the root   lt configuration gt  element    Move the configSections element to the top - just above where system data is currently

[c#] An unhandled exception of type 'System.TypeInitializationException' occurred in EntityFramework.dll

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