Message: System.IO.FileLoadException : Could not load file

Question

Message: System.IO.FileLoadException : Could not load file or assembly 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=1.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

 

whilwe doing unit testing in asp.netr core with angular2, i am facing this error .

 

 

please help me out of this.