Your project references the latest version of Entity Framework... - Error
<p>I trying to create an entity data model with Oracle. I am getting this error.</p>

<p><a href="https://i.stack.imgur.com/zlPDm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zlPDm.png" alt="enter image description here"></a></p>

<p>I have these installed for my solution.</p>

<p><a href="https://i.stack.imgur.com/PSsxx.png" rel="noreferrer"><img src="https://i.stack.imgur.com/PSsxx.png" alt="enter image description here"></a></p>

<p>I have also installed ODT for VS 2015. </p>

<p>These are my references showing. </p>

<p><a href="https://i.stack.imgur.com/j9UxU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/j9UxU.png" alt="enter image description here"></a></p>

<p>Web.config</p>

<pre><code>&lt;configSections&gt;
    &lt;section name="entityFramework"     
             type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection,     EntityFramework, Version=6.0.0.0, Culture=neutral,     PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt;
    &lt;section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /&gt;
&lt;/configSections&gt;
&lt;connectionStrings&gt;
    &lt;add name="OracleDbContext" 
         providerName="Oracle.ManagedDataAccess.Client" 
         connectionString="User Id=system;Password=myPassword;Data Source=ABC_DB" /&gt;
&lt;/connectionStrings&gt;
&lt;appSettings&gt;
    &lt;add key="webpages:Version" value="3.0.0.0" /&gt;
    &lt;add key="webpages:Enabled" value="false" /&gt;
    &lt;add key="ClientValidationEnabled" value="true" /&gt;
    &lt;add key="UnobtrusiveJavaScriptEnabled" value="true" /&gt;
&lt;/appSettings&gt;
&lt;system.web&gt;
    &lt;authentication mode="None" /&gt;
    &lt;compilation debug="true" targetFramework="4.5.2" /&gt;
    &lt;httpRuntime targetFramework="4.5.2" /&gt;
&lt;/system.web&gt;
&lt;system.webServer&gt;
   &lt;modules&gt;
       &lt;remove name="FormsAuthentication" /&gt;
   &lt;/modules&gt;
&lt;/system.webServer&gt;
&lt;runtime&gt;
 ........
&lt;/runtime&gt;
&lt;entityFramework&gt;
    &lt;defaultConnectionFactory  
         type="Oracle.ManagedDataAccess.EntityFramework.OracleConnectionFactory, Oracle.ManagedDataAccess.EntityFramework"&gt;
    &lt;/defaultConnectionFactory&gt;
    &lt;providers&gt;
        &lt;!--&lt;provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" /&gt;
        &lt;provider invariantName="Oracle.ManagedDataAccess.Client" 
                  type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /&gt;--&gt;
        &lt;provider invariantName="Oracle.ManagedDataAccess.Client" 
                  type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /&gt;
    &lt;/providers&gt;
&lt;/entityFramework&gt;
&lt;system.codedom&gt;
    &lt;compilers&gt;
        &lt;compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" /&gt;
        &lt;compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&amp;quot;Web\&amp;quot; /optionInfer+" /&gt;
    &lt;/compilers&gt;
&lt;/system.codedom&gt;
&lt;system.data&gt;
   &lt;DbProviderFactories&gt;
       &lt;remove invariant="Oracle.ManagedDataAccess.Client" /&gt;
       &lt;add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /&gt;
    &lt;/DbProviderFactories&gt;
&lt;/system.data&gt;
&lt;oracle.manageddataaccess.client&gt;
  &lt;version number="*"&gt;
  &lt;dataSources&gt;
    &lt;dataSource alias="SampleDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL))) " /&gt;
  &lt;/dataSources&gt;
 &lt;/version&gt;
&lt;/oracle.manageddataaccess.client&gt;
</code></pre>

<p>What am I missing?</p>