Nuget package for netcoreapp1.0

I create a Nuget package from project created on VS 2015 and upload it to Nuget when I try to use it on desktop application it's works, but when I try to use it in .netcoreapp1.0 it's not works and always give me An unhandled exception of type 'System.IO.FileLoadException' occurred in ConsoleApp11.dll

Additional information: Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Any suggestion about this error?