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This article applies to:
✔️ .NET Core 2.1.100 SDK and later versions
NuGet writes a file named
project.assets.json
in the
obj
folder, and the .NET SDK uses it to get information about packages to pass into the compiler. This error occurs when the assets file
project.assets.json
is not found during build. The full error message is similar to the following example:
NETSDK1004: Assets file 'C:\path\to\project.assets.json' not found. Run a NuGet package restore to generate this file.
Here are some possible causes of the error:
You are running the
dotnet build
command from a directory path that contains a
%
character. To resolve the error, remove the
%
from the folder name, and rerun
dotnet build
.
A change to the project file wasn't automatically detected and restored by the project system. To resolve the error, open a command prompt and run
dotnet restore
on the project.
A project was restored separately by an older version of Nuget.exe. To resolve the error, open a command prompt and run
dotnet restore
on the project.
An earlier error, such as NETSDK1045 (the version of the SDK you're using doesn't support the project's target framework), prevented NuGet from creating the project assets file. To resolve the NETSDK1004 error, resolve the earlier error, and then run
dotnet restore
on the project.
App Center CI is building a project that has an external assembly that is not in NuGet. To resolve the error, use a NuGet package for the assembly.
You added a solution folder in Visual Studio with a name that starts with a period. To resolve the error, remove the leading period from the folder name.
You have a source in the
<packageSources>
section in the
NuGet.Config
file with a path that doesn't exist. To resolve the error, edit the
NuGet.Config
file to correct the package source path.
