Restore errors and warnings

This document contains a list of all warnings and errors that may occur during restore.

Updated Errors in 4.3.0

Missing packages and projects

NU2001

Issue

The package id cannot be found on any sources.

Common causes

The correct package source is missing or the package id has a typo.

Example

Unable to find package 'a'. No packages exist with this id in source(s): http://dotnet.myget.org/F/nuget-build/, https://api.nuget.org/v3/index.json

NU2002

Issue

The package id is found but a version within the specified dependency range cannot be found on any of the sources.

Common causes

The correct package source is missing or the dependency range is incorrect. The range might be specified by a package and not the user.

The user may need to switch to an available version if this package is referenced by the project directly.

Example

Unable to find package 'a' with version >= 1.0.0
  - Found 2839 version(s) in http://dotnet.myget.org/F/nuget-build/  [ Nearest version: 1.0.0-beta ]
  - Found 0 version(s) in https://api.nuget.org/v3/index.json

NU2003

Issue

No stable versions were found in the dependency range. Pre-release versions were found but are not allowed.

Common causes

The project specified a stable version for the dependency range. Users need to change this to include pre-release versions.

Example

Unable to find a stable package 'a' with version >= 1.0.0
  - Found 2839 version(s) in http://dotnet.myget.org/F/nuget-build/  [ Nearest version: 1.0.0-beta ]
  - Found 0 version(s) in https://api.nuget.org/v3/index.json

NU2004

Issue

A ProjectReference points to a file that does not exist.

Common causes

The project file is missing from disk or the reference is incorrect.

Example

Project reference does not exist 'c:\a.csproj'. Check that the project reference is valid and that the project file exists.

NU2005

Issue

The project file exists but no restore information was provided for it.

Common causes

In Visual Studio this could mean that the project is unloaded. From the command line this could mean that the file is corrupt or that it does not contain the custom after imports target needed for restore to read the project.

Example

Unable to read project information for 'c:\a.csproj'. The project file may be invalid or missing targets required for restore.

Errors in 4.2.0

Code	Project	Group	Message	Fields	Comments
	DependencyResolver	Http	The feed {0} lists package {1} but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again	uri, package	Feed is likely corrupt, recently added this message
	NuGet.Commands	resolver	Failed to resolve conflicts for {0}	graph
	NuGet.Commands	resolver	Unable to satisfy conflicting requests for {0}: {1}	packages	combines all conflicts into a single message
	NuGet.Commands	compat	{0} {1} provides a compile-time reference assembly for {2} on {3}, but there is no compatible run-time assembly	package, framework	Log_MissingImplementationFx
	NuGet.Commands	compat	{0} {1} provides a compile-time reference assembly for {2} on {3}, but there is no run-time assembly compatible with {4}	package, framework	Log_MissingImplementationFxRuntime
	NuGet.Commands	compat	Package {0} {1} is not compatible with {2}	package, framework	Log_PackageNotCompatibleWithFx (complete message)
	NuGet.Commands	compat	Project {0} is not compatible with {1}	project, framework	Log_ProjectNotCompatibleWithFx
	NuGet.Commands	notfound	Unable to resolve {0} for {1}	project, graph	A package cannot be found on the feeds. (Highest priority to improve )
	NuGet.Commands	resolver	Cycle detected: a -> b -> a	packages	circular dependency
	NuGet.Commands	resolver	Version conflict detected for {0}
	NuGet.Commands	summary	One or more projects are incompatible with {0}	project	remove this?
	NuGet.Commands	summary	One or more packages are incompatible with {0}	project	remove this?
	NuGet.Commands	input	The project {0} does not specify any target frameworks in {1}	project, path
	NuGet.Protocol	http	<http exception>		PromptForProxyCredentialsAsync
	NuGet.Procotol	http	Failed to download package {0} from {1} <exception>	package, source	download error
	NuGet.Commands	package	Unknown build action		nuspec contains invalid contentFiles data
	NuGet.Commands	disk	Failed to find a project to restore in the folder {0}	UnauthorizedAccessException
	NuGet.Commands	input	Ambiguous project name {0}	project	root project has a duplicate
	NuGet.Commands	internal	Missing external reference metadata for {0}	project	project data was not provided, internal issue
	NuGet.Commands	input	Invalid input {0}. Valid file names are project.json or *.project.json		no longer needed?
	NuGet.Commands	input	File not found {0}	path	input file was not found
	NuGet.Protocol	feed	InvalidDataException {0}	Url	invalid registration file InvalidDataException(registrationUri.AbsoluteUri)
	NuGet.Protocol	feed	The JSON document is not an object.
	NuGet.Protocol	feed	The JSON document is not complete.
	NuGet.Protocol	feed	An error occurred while retrieving package metadata for {0} from source {1}	package, source	exception from source
	NuGet.Protocol	feed	Error downloading {0} from {1}
	NuGet.Protocol	feed	The V2 feed at {0} returned an unexpected status code {1} {2}
	NuGet.Protocol	feed	The path {0} for the selected source could not be resolved.

Warnings in 4.2.0

Code	Project	Group	Message	Fields	Comments
	NuGet.Build.Tasks	Input	Unable to find a project to restore!
	NuGet.Protocol	Http	An invalid cache entry was found for URL {0} and will be replaced	Uri	thrown for any invalid data
	NuGet.Protocol	Http	<Message from server>		This contains whatever the server wants to display to the user from X-NuGet-Warning
	NuGet.Protocol	Http	Unable to find package	Package Id
	NuGet.Protocol	Nupkg	The file {0} is corrupt	path	Nupkg is corrupt or unreadable
	NuGet.Protocol	Local	The folder {0} contains an invalid version	path	v3 folder with invalid sub folder
	NuGet.Protocol	Local	<File system exception message>
	NuGet.Commands	Input	The folder {0} does not contain a project to restore	path
	NuGet.Commands	Package	Dependency specified was {0} {1} but ended up with {2} {3}	packages	Version bumped
	NuGet.Commands	Project	Package {0} was restored using {1} instead the project target framework {2}. This may cause compatibility problems	package, framework	imports
	NuGet.Commands	Package	Detected package downgrade: {0} from {1} to {2}	package, versions	Downgrade warning
	NuGet.Commands	Input	Unknown Compatibility Profile: {0}	compat profile	bad input from project
	NuGet.Commands	Project	Package {0} was restored using {1} instead the project target framework {2}. This may cause compatibility problems.	package, fallback, framework