February 11, 2017
Here’s how I fixed this error. It happened to me in this environment:
I had this error inside of VS Code when I opened up a Unity project:
The reference assemblies for framework “.NETFramework,Version=v3.5” were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
Also, VS Code’s code completion did not work. Even with the right version of OpenSSL:
openssl version OpenSSL 1.0.2k 26 Jan 2017
dotnet Microsoft .NET Core Shared Framework Host Version : 1.1.0 Build : 928f77c4bc3f49d892459992fb6e1d5542cb5e86
I found this fix here: https://github.com/OmniSharp/omnisharp-vscode/issues/1004
The solution was to install mono with brew
brew install mono
with that, I could run
mono in the terminal
mono --version Mono JIT compiler version 4.6.2 (Stable 220.127.116.11/ac9e222 Sun Jan 8 00:00:20 GMT 2017) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: normal SIGSEGV: altstack Notification: kqueue Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen
just to prove it is installed. When I opened VS Code again, the OmniSharp extension found mono and let me know in its own output window while starting up and loading the project in VS Code:
iscovered Mono file path: /usr/local/bin/mono Resolved symbolic link for Mono file path: /usr/local/Cellar/mono/18.104.22.168/bin/mono-sgen
Then my code completion worked. Yay!