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Nuget mismatch when compiling Build Script and nuget addin.

See original GitHub issue

What You Are Seeing?

Fails to run script that was previously working mismatch with nuget.core versions…

Preparing to run build script...
Running build script...
Analyzing build script...
Processing build script...
Installing addins...
Compiling build script...
Error: error CS1705: Assembly 'Cake, Version=0.20.0.0, Culture=neutral, PublicKeyTo
.14.0.832, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher ver
Core, Version=2.12.0.817, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

What is Expected?

Runs normally.

What version of Cake are you using?

0.20.0 (previous versions worked)

Are you running on a 32 or 64 bit system?

64bit

What environment are you running on? Windows? Linux? Mac?

Windows

Are you running on a CI Server? If so, which one?

AppVeyor (but can reproduce locally)

https://ci.appveyor.com/project/danwalmsley/avalonstudio/build/0.2.0.2978

How Did You Get This To Happen? (Steps to Reproduce)

I hadn’t pinned cake to a specific version (you learn some things the hard way)

Build.cake for repro…

I had thought changing the version for the nuget.core package would have fixed it, but doesn’t seem to resolve it.

/////////////////////////////////////////////////////////////////////
// ADDINS
/////////////////////////////////////////////////////////////////////

#addin "Cake.FileHelpers"
#addin "Cake.Docker"
#addin "nuget:?package=NuGet.Core&version=2.12.0"

//////////////////////////////////////////////////////////////////////
// TOOLS
//////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////
// USINGS
///////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////
// ARGUMENTS
//////////////////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////////////////////////
// TASKS
/////////////////////////////////////////////////////////////////////////////// 

Task("Restore-NetCore")
    .IsDependentOn("Clean")
    .Does(() =>
{
    foreach (var project in netCoreProjects)
    {
        DotNetCoreRestore(project.Path);
    }
});

Task("Default")
    .IsDependentOn("Restore-NetCore");

RunTarget(target);