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Ionide FSI fails to load Newtonsoft.Json assembly #1101

aggieben opened this issue May 14, 2019 · 1 comment


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commented May 14, 2019

Describe the bug
FSI running in Ionide fails to load the Newtonsoft.Json assembly, which was referenced by paket-generated load scripts.

To Reproduce
Steps to reproduce the behaviour:

  1. Create new directory, initialize paket
  2. Add Akka.FSharp to paket.dependencies
  3. paket install
  4. paket generate-load-scripts -t fsx
  5. Create test.fsx with the content shown below
  6. Open test.fsx, and run the "FSI: Send File" (fsharp.fsacRuntime is set to netcore)
  7. Observe error (shown below)

test.fsx content:

#load ".paket/load/netstandard2.1/Akka.FSharp.fsx"

open Akka.Actor

let system = ActorSystem.Create("FSharp")


System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Newtonsoft.Json, Version=, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'. The system cannot find the file specified.

   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at Akka.Serialization.Serialization..ctor(ExtendedActorSystem system)
   at Akka.Actor.Internal.ActorSystemImpl..ctor(String name, Config config)
   at <StartupCode$FSI_0003>.$FSI_0003.main@()
Stopped due to error

Expected behaviour
Following the steps 1-5, and then invoking #load "test.fsx" in standalone FSI (run as dotnet fsi), and the script succeeds.

If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

  • OS: macOS 10.14.4
  • Ionide version: 3.37.0
  • VSCode version: 1.33.1
  • dotnet SDK version: 3.0-preview4 / preview5
  • mono / .Net Framework version: Mono

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commented May 14, 2019

Hey @aggieben 👋,

Thank you for opening an issue. We will get back to you as
soon as we can. Also, check out our OpenCollective and consider
backing us.

PS.: We offer backer support for all backers. Don't forget to add backer label when you start backing us 😄

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