Question

I am having a weird issue with nuget.exe command line tool.

I have a console application that launches a process which executes nuget command line tool.

Here is the output:

nuget.exe pack Project.csproj -Prop Configuration=Release 
Attempting to build package from 'Project.csproj'. Packing files from
'C:\Project\bin\Release'.

It throws an Object reference not set to an instance of an object. exception.

But the way, my process WorkingDirectory is C:\Project, so the file path is ok.

What is weird is that when I use the standard windows command line, cd into the .csproj folder and execute the same command, the nupkg file is being created.

If I do:

cd ..

and runs:

nuget.exe pack Project\Project.csproj -Prop Configuration=Release

I am getting the Object reference not set to an instance of an object. exception.

My console application code is:

var process = new Process  {
    StartInfo = new ProcessStartInfo("nuget.exe", 
                                     "pack Project.csproj -Prop Configuration=Release")
                    {
                        WorkingDirectory = "C:\\Project",
                        UseShellExecute = false,
                        RedirectStandardInput = true,
                    }
};

Answer 1

I had the same issue and my problem was that after an update of an package (and a merge in SVN), the packages.config file still had both versions of the package referenced: the old and the new package. After I deleted the folder with the old package, the “Object reference not set to an instance of an object.”-error popped up.

So, to solve that error, be sure that your packages.config file only has one version of a package in it.