Add-Migration command not working in EF 7 for UWP app

I'm following getting started with EF 7 for UWP apps official tutorial.

When I'm at Add-Migration MyFirstMigration, it throws following error:

PM> Add-Migration MyFirstMigration

Add-Migration : Exception calling "CreateInstanceAndUnwrap" with "8" argument(s): "Could not load file or assembly 'AppShellProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' 
or one of its dependencies. An attempt was made to load a program with an incorrect format."
At line:1 char:1
+ Add-Migration MyFirstMigration
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Add-Migration], MethodInvocationException
    + FullyQualifiedErrorId : BadImageFormatException,Add-Migration

Has anyone figured out any workaround?