The type 'Object' is defined in an assembly that is not referenced

Question

This is the first time I have used abp to build a project using templates. I tried a lot of ways to find out how to fix this problem but failed.

• Abp package version: 3.0.0
• Base framework: .Net Framework 4.6.1

Exception: The type 'Object' is defined in an assembly that is not referenced.You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

Answer 1

ABP v3.0.0 is based on .NET Standard 2.0.

• This concerns you regardless if you are on MVC 5.x, .NET Framework 4.x or .NET Core 2.x.
• You should use VS2017 15.3.3+.
  • For VS2015, you may try installing NuGet client 3.6 or higher but that may no longer work.