[F#]; [Compilation error]; Cannot compile any F# program

user_8666695 0
Viewed 788

I just started programming in F# (using Visual Studio 2017 on windows 10) and I can't compile any F# program I try to write.

I created a console application and wrote some code but got stuck immediately as the compilation failed:

open System
printf "hello world"
Console.ReadKey() |> ignore

And here's what i got:

Error FS0193 The module/namespace 'System.Collections.Generic' from compilation unit 'mscorlib' did not contain the namespace, module or type 'IReadOnlyCollection`1'

I also tried a simpler version:

printf "Hey"

And got that:

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Unknown Module. Could not load file or assembly 'FSharp.Core, Version=4.4.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

I tried to repair Visual Studio through the Visual Studio Installer but it did not help.

visual-studio-2017 f# .net
2 Answers

I solved this by deleting references to mscorlib and rebuilding (VS2017)

user_3435500

I just created a brand new solution and it worked perfectly fine... I still don't know what the problem was though...

user_86666950
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