remove nuget config.
DELETE
nuget.config
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
- <packageSources>
- <clear/>
- <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
- <add key="AvaloniCI" value="https://www.myget.org/F/avalonia-ci/api/v2" />
- <add key="Avalonia-PRS" value="https://www.myget.org/F/avalonia-prs/api/v2" />
- <add key="XamlBehaviors" value="https://www.myget.org/F/xamlbehaviors-nightly/api/v2" />
- <add key="sharpgen" value="https://www.myget.org/F/sharpgentools/api/v3/index.json" />
- <add key="cli-deps" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
- <add key="netcore" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
- <add key="Roslyn Nightlies" value="https://dotnet.myget.org/F/roslyn/api/v3/index.json" />
- <add key="DockNightly" value="https://www.myget.org/F/dock-nightly/api/v2" />
- </packageSources>
-</configuration>
\ No newline at end of file

remove nuget config.