title	description	author	ms.author	ms.date	ms.topic	ms.reviewer
NuGet Errors and Warnings Reference	Complete reference for warnings and errors issued from NuGet during various NuGet operations.	JonDouglas	jodou	05/18/2018	reference	anangaur

Errors and warnings

In NuGet 4.3.0+, errors and warnings are numbered as described in this topic and provide detailed information to help you address the issues involved.

The errors and warnings listed here are available only with PackageReference-based projects and NuGet 4.3.0+. NuGet also honors MSBuild properties to suppress warnings or elevate them to errors. For more information, see How to: Suppress Compiler Warnings in the Visual Studio documentation.

NuGet supports the following configuration properties.

Property	Scope	Description
TreatWarningsAsErrors	Project	Treats all NuGet warnings as errors
NoWarn	Project, PackageReference, ProjectReference	Suppress the warning for the current project, package or project reference
WarningsAsErrors	Project	Treat certain warnings as errors
WarningsNotAsErrors	Project	Treat certain warnings not as errors. Used in combination with `TreatWarningsAsErrors` set to true.

Errors

Group	Error Numbers
Invalid input errors	NU1001, NU1002, NU1003, NU1004, NU1005, NU1006, NU1007, NU1008, NU1009, NU1010, NU1011, NU1012, NU1013, NU1014, NU1015, NU1016, NU1017
Missing package and project errors	NU1100, NU1101, NU1102, NU1103, NU1104, NU1105, NU1106, NU1107, NU1108, NU1109
Package source mapping errors	NU1110
Compatibility errors	NU1201, NU1202, NU1203, NU1204, NU1401, NU1402, NU1403
Dotnet Tool restore errors	NU1211, NU1212, NU1213
NuGet source errors	NU1301, NU1302
NuGet internal errors	NU1000
Signed packages errors (creation and verification)	NU3001, NU3004, NU3005, NU3008, NU3034
Pack Errors	NU5000, NU5001, NU5002, NU5003, NU5004, NU5005, NU5007, NU5008, NU5009, NU5010, NU5011, NU5012, NU5013, NU5014, NU5015, NU5016, NU5017, NU5018, NU5019, NU5020, NU5021, NU5022, NU5023, NU5024, NU5025, NU5026, NU5027, NU5028, NU5029, NU5036, NU5042, NU5049
License specific Pack Errors	NU5030, NU5031, NU5032, NU5033, NU5034, NU5035
NuGetAudit specific warnings	NU1014, NU1900, NU1901, NU1902, NU1903, NU1904, NU1905

Warnings

Group	Warning numbers
Invalid input warnings	NU1501, NU1502, NU1503, NU1504, NU1505, NU1506, NU1507, NU1508, NU1509, NU1510, NU1511
Unexpected package version warnings	NU1601, NU1602, NU1603, NU1604, NU1605, NU1606, NU1607
Resolver conflict warnings	NU1608
Package fallback warnings	NU1701, NU1702, NU1703
Feed warnings	NU1801, NU1802, NU1803
NuGet internal warnings	NU1500
Signed packages warnings (creation and verification)	NU3000, NU3002, NU3003, NU3006, NU3007, NU3009, NU3010, NU3011, NU3012, NU3013, NU3014, NU3015, NU3016, NU3017, NU3018, NU3019, NU3020, NU3021, NU3022, NU3023, NU3024, NU3025, NU3026, NU3027, NU3028, NU3029, NU3030, NU3031, NU3032, NU3033, NU3035, NU3036, NU3037, NU3038, NU3040, NU3042, NU3043
Pack Warnings	NU5100, NU5101, NU5102, NU5103, NU5104, NU5105, NU5106, NU5107, NU5108, NU5109, NU5110, NU5111, NU5112, NU5114, NU5115, NU5116, NU5117, NU5118, NU5119, NU5120, NU5121, NU5122, NU5123, NU5127, NU5128, NU5129, NU5130, NU5131, NU5133, NU5500, NU5501
License specific Pack Warnings	NU5124, NU5125
Icon specific Pack Warnings	NU5046, NU5047, NU5048

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