Why won't AutoMapper v3 work because it's looking for v2.2.1.0?

I just installed AutoMapper, via nuGet, on a new project, but when I run the code, I get the following error:

Could not load file or assembly 'AutoMapper, Version=2.2.1.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Why is it looking for Version=2.2.1.0, and what can I do about it? Revert to that version?

Solution

You probably just want to add a binding redirect for AutoMapper as one of your references is looking for version 2.2 specifically

This should do it:

 <dependentAssembly>
      <assemblyIdentity name="AutoMapper" publicKeyToken="be96cd2c38ef1005" 
                     culture="neutral"/>
      <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
    </dependentAssembly>