Error on deploy when referencing a .NET Standard library

[bslatner]

I recently discovered that if I add a reference to a project targeting .NET Standard 1.4 to my serverless project, I get the following error on dotnet lambda deploy-serverless:

Error: Project is referencing NETStandard.Library version 1.6.1. Max version supported by netcoreapp1.0 is 1.6.0.
Error: NETStandard.Library 1.6.1 is used for target framework netcoreapp1.1.
Error: Check the following dependencies for versions compatible with netcoreapp1.0:
Error:  amazon.lambda.apigatewayevents : 1.1.0
Error:  amazon.lambda.serialization.json : 1.1.0
Error:  testclasslibrary : 1.0.0

To reproduce. From Visual Studio 2017 (latest updates installed):

• File -> New Project
• Select AWS Serverless Application (.NET Core)
• Pick anything for the blueprint. I chose the blog API
• From project directory
  • dotnet restore
  • dotnet build
  • dotnet lambda deploy-serverless
• Observe that deployment works
• Right click on solution in VS. Add .NET standard class library
• Change targeting of library to .NET Standard 1.4
• In Solution Explorer, right click on Dependencies under serverless app
• Add a project reference to the class library
• File -> Save All
• From project directory
  • dotnet restore
  • dotnet build
  • dotnet lambda deploy-serverless
• Observe that deployment fails

[bslatner]

Incidentally, this appears to happen regardless of which version of .NET Standard you target in the class library.

[normj]

In your csproj file for the class library can add the following as a sibling to the TargetFramework to force the implicit reference of NETStandard.Library to be 1.6.0.

<NetStandardImplicitPackageVersion>1.6.0</NetStandardImplicitPackageVersion>

[normj]

Closing as I believe my last comment should unblock you. If not feel free to reopen.

[bslatner]

That did the trick. Thanks.

[mrwcjoughin]

thanks @normj - that tag did the trick!