Unexpected character encountered while parsing number: W. Path '' - Visual Studio Mac

[jthake]

I have just installed for first time on my iMac Visual Studio for Mac 7.5.3 (build 7).

I created a new Azure Functions project. I run it up in a debugger. When I call the default httptrigger in postman I get this error

[7/4/18 9:18:26 PM] Executing 'HttpTrigger' (Reason='This function was programmatically called via the host APIs.', Id=32ee26bd-13b2-4979-b32a-66ba4e49f517)
[7/4/18 9:18:26 PM] C# HTTP trigger function processed a request.
[7/4/18 9:18:29 PM] Executed 'HttpTrigger' (Failed, Id=32ee26bd-13b2-4979-b32a-66ba4e49f517)
[7/4/18 9:18:29 PM] System.Private.CoreLib: Exception while executing function: HttpTrigger. Newtonsoft.Json: Unexpected character encountered while parsing number: W. Path '', line 1, position 6.

From searching around. There appears to be a related error around it using the 1.0.13 version of the Microsoft.NET.Sdk.Functions in a Windows version of Visual Studio. It just seems odd that the default new project would set these if they were not correct?

The csproj file looks like this

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <AzureFunctionsVersion>v2</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.13" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

My dotnet version is:

e$ dotnet --info
.NET Command Line Tools (2.1.4)

Product Information:
 Version:            2.1.4
 Commit SHA-1 hash:  5e8add2190

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.13
 OS Platform: Darwin
 RID:         osx.10.12-x64
 Base Path:   /usr/local/share/dotnet/sdk/2.1.4/

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.5
  Build    : 17373eb129b3b05aa18ece963f8795d65ef8ea54

Full debug terminal window

Hosting environment: Production
Content root path: /Users/jeremythake/Projects/YouStorianAPI/YouStorianAPI/bin/Debug/netstandard2.0
Now listening on: http://localhost:7071
Application started. Press Ctrl+C to shut down.
[7/4/18 9:18:20 PM] Reading host configuration file '/Users/jeremythake/Projects/YouStorianAPI/YouStorianAPI/bin/Debug/netstandard2.0/host.json'
[7/4/18 9:18:20 PM] Host configuration file read:
[7/4/18 9:18:20 PM] {}
[7/4/18 9:18:20 PM] Starting Host (HostId=jeremysimac-749503778, InstanceId=151bf265-a4b1-41ee-b2a4-5c023d154fb1, Version=2.0.11651.0, ProcessId=3900, AppDomainId=1, Debug=False, ConsecutiveErrors=0, StartupCount=1, FunctionsExtensionVersion=)
[7/4/18 9:18:21 PM] Unable to configure java worker. Could not find JAVA_HOME app setting.
[7/4/18 9:18:21 PM] 
[7/4/18 9:18:21 PM] Could not configure language worker Java.
[7/4/18 9:18:21 PM] 
[7/4/18 9:18:21 PM] Generating 1 job function(s)
[7/4/18 9:18:21 PM] Found the following functions:
[7/4/18 9:18:21 PM] YouStorianAPI.HttpTrigger.Run
[7/4/18 9:18:21 PM] 
[7/4/18 9:18:21 PM] Host initialized (1029ms)
Listening on http://localhost:7071/
Hit CTRL-C to exit...

Http Functions:

	HttpTrigger: http://localhost:7071/api/HttpTrigger

[7/4/18 9:18:22 PM] Host started (1511ms)
[7/4/18 9:18:22 PM] Job host started
[7/4/18 9:18:26 PM] Executing 'HttpTrigger' (Reason='This function was programmatically called via the host APIs.', Id=32ee26bd-13b2-4979-b32a-66ba4e49f517)
[7/4/18 9:18:26 PM] C# HTTP trigger function processed a request.
[7/4/18 9:18:29 PM] Executed 'HttpTrigger' (Failed, Id=32ee26bd-13b2-4979-b32a-66ba4e49f517)
[7/4/18 9:18:29 PM] System.Private.CoreLib: Exception while executing function: HttpTrigger. Newtonsoft.Json: Unexpected character encountered while parsing number: W. Path '', line 1, position 6.

[jthake]

UPDATE: I right clicked in Visual Studio for Mac and updated the nuget package for Microsoft.NET.Sdk.Functions 1.0.14. I cleaned my build, rebuilt and ran.
Now when I run the function. I get this error

[7/4/18 9:40:41 PM] System.Private.CoreLib: Exception while executing function: HttpTrigger. YouStorianAPI: Could not load file or assembly 'Newtonsoft.Json, Version=11.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'. Could not find or load a specific file. (Exception from HRESULT: 0x80131621). System.Private.CoreLib: Could not load file or assembly 'Newtonsoft.Json, Version=11.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'.

I can see if i expand the nuget package that its pulled down Newtonsoft.Json (11.0.2). If I try and add the nuget package for 11.0.0 it does not exist as an available package.

I'm sure this is something silly. Can someone point me in the correct direction?

I used brew to update the CLI as described too. That didn't seem to fix anything either.

[ianadavies]

Take a look at my post here

The suggested fix worked for me.

[jthake]

Thanks @ianadavies but unfortunately I had updated to the latest CLI too and still same error.

[LeviSchuck]

I am experiencing the same problem.

This has been recorded in https://youtu.be/v4DuNIA8dG4

I documented it in Azure/azure-functions-vs-build-sdk#218 though it seems issues on this repo are being ignored.

I encounter this problem if

1. I upgrade to .14
2. OR I add <PackageReference Include="Newtonsoft.Json" Version="11.0.2" /> while on .13

[LeviSchuck]

This SO post refers to the CLI version being to blame
https://stackoverflow.com/questions/51304256/azure-functions-newtonsoft-json-load-error?rq=1
Indeed my output states
Starting Host (HostId=levismacbook-144611310, InstanceId=a2531763-6b68-4424-9ccf-79ea75a2e5a3, Version=2.0.11651.0, ProcessId=88078, AppDomainId=1, Debug=False, ConsecutiveErrors=0, StartupCount=1, FunctionsExtensionVersion=)
which this SO post blames (2.0.11651.0)

I tried reinstalling the utilities, however I see

Warning: azure/functions/azure-functions-core-tools 2.0.1-beta.34 is already installed and up-to-date
To reinstall 2.0.1-beta.34, run `brew reinstall azure-functions-core-tools`

func reports version 2.0.11946.0
So I seem to have a newer CLI version than what visual studio Mac uses.

[JohnReeson]

@jthake-msft @LeviSchuck Have you tried to run func start in your content root path shown in your cli output like [ProjectPath]/bin/Debug/netstandard2.0? Json.Net v11 works with azure-functions-core-tools 2.0.1-beta.34 on my side.

[LeviSchuck]

Hello @JohnReeson
I tried two things, I changed the update channel to visual studio for Mac to Alpha, and also ran that command.
Either or both of those unblocked this issue as a work around.

[fabiocav]

Closing this as this was on a pre-release version of the core tools. Please retry and open a new issue if you're still running into problems.