My prebuild event command with reference to a library (from Nuget) does not compile the program

Question

I've been learning F# for some time, and I wanted to try creating a small SQL parser. I have found a tutorial that explains how to do this through FsLex and FsYacc, however, the site does not give any download links. Under Visual Studio, via nuget, I come across this, which I then download. It seems very similar to the explanations provided by the site, so I don't think it's related to the problem.

I'm not far from it yet, here are my two little files :

Sql.fs:

module Sql

type value = 
    | Int of int
    | Float of float
    | String of string

type dir = Asc | Desc
type op = Eq | Gt | Ge | Lt | Le

type order = string * dir

type where = 
    | Cond of (value * op * value)
    | And of where * where
    | Or of where * where

type joinType = Inner | Left | Right

type join = string * joinType * where option

type sqlStatement = 
    {
        Table : string;
        Columns : string list;
        Joins : join list;
        Where : where option;
        OrderBy : order list
    }

SqlParser.fsp:

module SqlParser

%{
open Sql
%}

%token <string> ID
%token <int> INT
%token <float> FLOAT

%token AND OR
%token COMMA
%token EQ LT LE GT GE
%token JOIN INNER LEFT RIGHT ON
%token SELECT FROM WHERE ORDER BY
%token ASC DESC
%token EOF

// start
%start start
%type <string> start

%%

start:
    |       { "Nothing to see here" }

%%

Here is the list of files / references of my project :

 References:
    - FSharp.Core
    - FsLexYacc.Runtime
    - mscorlib
    - System
    - System.Core
    - System.Numerics
    - System.ValueTuple
 AssemblyInfo.fs
 Sql.fs
 SqlParser.fsp
 App.config
 packages.config

And here is the prebuild command, which is supposed to interact with the "SqlParser.fsp" file:

fsyacc "$(ProjectDir)SqlParser.fsp"

When I compile, with this command, Visual Studio tells me "Generation failure", yet there are no errors, the list of these is empty. When I remove this command, the project compiles "normally", indeed the file "SqlParser.fsp" should have generated other files (hence the prebuild command).

• Did I miss anything?
• Is the FsLexYacc library obsolete?
• Isn't the tutorial correct?
• ...

Thank you in advance.