MSBUILD : error MSB4025: The project file could not be loaded. Data at the root level is invalid. Line 1, position 1.

[ranbuch]

I'm getting this error:

Build FAILED.
       "c:\Users\ranbu\Documents\dev\creators3d-dot-net-core\project.json" (Build target) (1) ->
         MSBUILD : error MSB4025: The project file could not be loaded. Data at the root level is invalid. Line 1, position 1. [c:\Users\ranbu\Documents\dev\creators3d-dot-net-core\project.json]
    0 Warning(s)
    1 Error(s)

I think it's not working since I've installed Visual Studio 2017 RC but I'm still using VS Code.

(I haven't migrated my project to Visual Studio 2017)

[SteveSandersonMS]

If you've installed VS2017RC, then your machine now has .NET Core Tools Preview 3 on it. That's not compatible with project.json-based projects such as yours.

There's an easy solution though :) Just add a file called global.json at the root of your project containing this:

{
  "sdk": { "version": "1.0.0-preview2-1-003177" }
}

Now the build system will know to build it using the Preview 2 tools.

[ranbuch]

I already have a global.json file and he looks like this:

{
  "sdk": { "version": "1.0.0-preview2-003121" }
}

I've tried to change it to what you've suggested but I'm still getting the same error.

[MarkPieszak]

Do you have that version of .NET Core tools (preview2) installed on your machine as well? @ranbuch

[ranbuch]

C:\Users\ranbu>dotnet --info
.NET Command Line Tools (1.0.0-preview3-004056)

Product Information:
 Version:            1.0.0-preview3-004056
 Commit SHA-1 hash:  ccc4968bc3

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64

How can I know if I have preview2 as well? I probably use to have . . .

[ranbuch]

Downloaded preview2 from here: https://www.microsoft.com/net/core#windowsvs2015

and installed it but dotnet --info still returns preview3 version.

[MarkPieszak]

Can you try installing the "Current" SDK ? https://www.microsoft.com/net/download/core#/current

[ranbuch]

That's what I've installed again, The link that you shared here is preview2.

[ranbuch]

@SteveSandersonMS can you please re-open this issue?

[SteveSandersonMS]

@ranbuch It doesn't seem like an issue in any JavaScriptServices code, so it's not like we can change anything in this repo to fix it. It only appears that you don't have the correct SDK installed. Please check c:\Program Files\dotnet\sdk and verify you have installed the 1.1 SDK whose version matches your global.json file.

If you are able to repro the issue in a way that points to it being specific to JavaScriptServices, please do let us know. For example, if you can take your failing project, strip out the JavaScriptServices code, and it starts working (without changing global.json or which SDKs are installed), that would imply there's an issue in this repo.

[ranbuch]

Understood, Thank you @SteveSandersonMS

[antmdvs]

@ranbuch

dotnet --info still returns preview3 version

Try running that from the folder that contains global.json. In the absence of a global.json, I believe the CLI always resolves to the subfolder of %PROGRAMFILES%\dotnet\sdk that represents the greatest semver version.

[miyelo]

hi, the solution for me was uninstall preview3 from the programs list

[ranbuch]

Thank you @miyelo

[Tiger333]

@miyelo thanks - also solved the problem for me