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NETSDK1138 indicates that your project targets a version of the framework that is out of support. The full error message is similar to the following example:
The target framework '<framework>' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.
Out-of-support versions include 1.0, 1.1, 2.0, 2.1, 2.2, 3.0, 3.1, 5, 6, and 7.
To resolve this error, change your project to target a supported version of .NET.
If you want to suppress the message without targeting a later framework, set the MSBuild property CheckEolTargetFramework to false. You can set it in the project file or by passing /p:CheckEolTargetFramework=false to a .NET CLI command, such as dotnet build. Here's an example project file:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp3.0</TargetFramework>
<CheckEolTargetFramework>false</CheckEolTargetFramework>
</PropertyGroup>
</Project>
Here's an example .NET CLI command:
dotnet build /p:CheckEolTargetFramework=false
See also
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