app.configで次を使用してこれを解決しました
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="EntityFramework" version="5.0.0.0"
publicKeyToken="b77a5c561934e089"
culture="neutral" />
<codeBase version="5.0.0.0" href="..\..\..\packages\EntityFramework.5.0.0-beta1\lib\net45\EntityFramework.dll" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="EntityFramework" version="4.1.0.0"
publicKeyToken="b77a5c561934e089"
culture="neutral" />
<codeBase version="4.1.0.0" href="..\..\..\packages\EntityFramework.4.1.10331.0\lib\EntityFramework.dll" />
</dependentAssembly>
</assemblyBinding>
</runtime>