Visual Studio 2019: Errors loading projects/scripts. Am I missing something?

Hello! I'm coming back to Unity after several years, and have run into a problem.

I have several versions of Unity installed, and I was running with Visual Studio 2017, but it was wanting to download/convert frameworks/scripts every time I tried to open it, so I decided just ditch VS17 and also use the new version of Unity.

So after searching for a solution, I updated Unity Hub and used it to install both Unity 2019.4.1f1 and Visual Studio 2019 (Community) at the same time. I made sure to point to VS19 in Unity's Preferences and selected Editor Attaching.

When I double-clicked a script, it opened up VS19. The script displayed, but there was no Inellisense. And VS19 wanted me to download ".Net desktop development," so I did. After that, every time I open script from Unity, VS19 loads the script (the text is all there), but then pops a message window up saying ("NewTests3" is the Unity project for the following):

"Microsoft Visual Studio
One or more projects in the solution were not loaded correctly.
Please see the Output Window for details."

In the Output Window, I get this message:

"E:\UNITY\PROJECTS\2019\NewTests3\Assembly-CSharp.csproj : error : Value cannot be null.
Parameter name: value"

In the Solution Explorer, it says the following:

"Solution 'NewTests3' (0of 1 project)
Assembly-CSharp (unloaded)"

When I right click Assembly-CSharp and try to reload it, another window pops up saying:

"Microsoft Visual Studio
Value cannot be null.
Parameter name:value"

I've tried all different types of reinstalling and modifying. I've tried Unity 2018.19.4f1. Same thing. I've tried several different types of options in Unity's Preferences. I've tried several different things in VS19's options (including Tools for Unity options).

I've also tried installing multiple frameworks and such. This is what I have installed according to VS19's Tools (under Tools, Get Tools and Features):

Visual Studio core editor

.NET desktop development

Desktop development with C++

Game development with Unity

Individual components
NuGet package manager
.NET Framework 4.6.1 targeting pack
C# and Visual Basic Roslyn compilers
C# and Visual Basic
F# language support
.NET Core 2.1 LTS Runtime
.NET Framework 4.6.2 targeting pack
.NET Framework 4.7 targeting pack
.NET Framework 4.8 targeting pack
NuGet targets and build tasks
.NET Framework 4.6.1 SDK
.NET Framework 4.6.2 SDK
.NET Framework 4.7 SDK
.NET Framework 4.7.1 SDK
.NET Framework 4.7.2 SDK

So I don't know what I'm lacking. I followed this tutorial and got Visual Studio Code to work, so it seems that it must be something simple with VS19. And I'd much rather use the full VS19 than VS Code.

I also tried following this tutorial to fix the problem, but it's years old, and the Tools for Unity that I have does not list the needed option.

Any help would definitely be appreciated!
Thank you very much, and may God bless you!

 

@DCTShinobi

It sounds like you've tried a bunch of the basic things I would have suggested. Perhaps it's similar to the issue reported here: https://developercommunity.visualst...projects-with-game-development-with-unit.html

There are some steps in that community ticket that may help resolve the issue you're having. Please let me know if any of them work or not.

 

Hi @DCTShinobi, could you try to upgrade to VS 16.6.3 ?

 

I am having this same issue with VS Community (16.8.4). If I open a unity project solution (Assets > Open C# Project) then it loads everything in just fine. If I try open a single C# script from the project (with VS closed) then it fails to fully load the solution. It's basically just note pad in this state.

 

Unable to add scripts in Hierarchy due to error showing script does not inherit a native class that can manage the script In Unity

 

i am facing issue with installing unity somewhat like microsoft visual studio community 2019 it is showing that completed with errors