Build fails with "Error: Field 'System.Net.ExceptionHelper.WebPermissionUnrestricted' not found"

[oreodave]

I was building using 'build.sh' and I encountered this error after downloading nuget and a few packages. A log file is attached to this, excerpt below.

Downloading NuGet...
Feeds used:
  /home/oreodave/.nuget/packages/
  https://api.nuget.org/v3/index.json
  https://dotnet.myget.org/F/dotnet-core/api/v3/index.json
  https://dotnet.myget.org/F/dotnet-cli/api/v3/index.json
  https://www.myget.org/F/omnisharp/api/v3/index.json
  https://dotnet.myget.org/F/roslyn/api/v3/index.json

....
Adding package 'SQLitePCLRaw.provider.e_sqlite3.net45.1.1.2' to folder '/home/oreodave/bin/omnisharp-roslyn/tools'
Added package 'SQLitePCLRaw.provider.e_sqlite3.net45.1.1.2' to folder '/home/oreodave/bin/omnisharp-roslyn/tools'
Restoring NuGet package xunit.runner.console.2.4.0.
Adding package 'xunit.runner.console.2.4.0' to folder '/home/oreodave/bin/omnisharp-roslyn/tools'
Added package 'xunit.runner.console.2.4.0' to folder '/home/oreodave/bin/omnisharp-roslyn/tools'
Error: Field 'System.Net.ExceptionHelper.WebPermissionUnrestricted' not found.

File
System details:
Ubuntu 18.04.2 LTS 64 bit
ZSH Shell
Dotnet 2.2.203

[unlimitedcoder2]

I am also having the same issue

[filipw]

which version of Mono do you have on your machine? Please try updating to the latest Mono https://www.mono-project.com/download/stable/

[filipw]

This error happens if you are on old version of Mono Error: Field 'System.Net.ExceptionHelper.WebPermissionUnrestricted' not found.

That said, building on Ubuntu 18.04 is currently not supported (see #1202 )