ASP.Net Entity Framework Error: The type exists in both assemblies

I'm using ASP.net framework in visual studio 2017 and using Stimulsoft Reports.Net ver 2017 I have this dll in my project:

Stimulsoft.Base.dll(2011.3.1200.0)

Stimulsoft.Report.Design.dll(2011.3.1200.0)

Stimulsoft.Report.dll(2011.3.1200.0)

Stimulsoft.Report.Web.dll(2011.3.1200.0)

but after running my page  I will encounter this error:

 CS0433: The type 'StiWebViewer' exists in both 'Stimulsoft.Report.Web, Version=2011.3.1200.0, Culture=neutral, PublicKeyToken=ebe6666cba19647a' and 'Stimulsoft.Report.WebViewer, Version=2017.1.3.0, Culture=neutral, PublicKeyToken=ebe6666cba19647a'

I don't know the reason for this error. Is the reason for this incompatibility, a difference between Stimulsoft reports version and dlls?

Where can I download the dlls that I mentioned earlier in the 2017 version? I searched on Nuget but I didn't find all of them.