NU1003: PackageTargetFallback and AssetTargetFallback cannot be used together

[jeffrymorris]

https://ci.appveyor.com/project/Couchbase/couchbase-extensions/build/47

Build started
git clone -q https://github.com/couchbaselabs/Couchbase.Extensions.git C:\projects\couchbase-extensions
git fetch -q origin +refs/pull/17/merge:
git checkout -qf FETCH_HEAD
appveyor-retry dotnet restore -v Minimal
C:\projects\couchbase-extensions\src\Couchbase.Extensions.DependencyInjection\Couchbase.Extensions.DependencyInjection.csproj : error NU1003: PackageTargetFallback and AssetTargetFallback cannot be used together. Remove PackageTargetFallback(deprecated) references from the project environment. [C:\projects\couchbase-extensions\Couchbase.Extensions.sln]
Command "dotnet restore -v Minimal" failed with exit code 1. Retrying 2 of 3
C:\projects\couchbase-extensions\src\Couchbase.Extensions.DependencyInjection\Couchbase.Extensions.DependencyInjection.csproj : error NU1003: PackageTargetFallback and AssetTargetFallback cannot be used together. Remove PackageTargetFallback(deprecated) references from the project environment. [C:\projects\couchbase-extensions\Couchbase.Extensions.sln]
Command "dotnet restore -v Minimal" failed with exit code 1. Retrying 3 of 3
C:\projects\couchbase-extensions\src\Couchbase.Extensions.DependencyInjection\Couchbase.Extensions.DependencyInjection.csproj : error NU1003: PackageTargetFallback and AssetTargetFallback cannot be used together. Remove PackageTargetFallback(deprecated) references from the project environment. [C:\projects\couchbase-extensions\Couchbase.Extensions.sln]
Sorry, we tried running command for 3 times and all attempts were unsuccessful!
Command exited with code 1