Error compiling gulp

I have a gulp file that when I use concat sends me an error when locating the path of a file.

The error is as follows

Error: Error: File not found with singular glob: /Users/mac/Documents/Proyectos/Gulp/build/node_modules/jquery/dist/jquery.min.js

my gulp file is as follows:

"use strict";

  const gulp         = require("gulp"),
        browserSync  = require("browser-sync").create(),
        autoprefixer = require("gulp-autoprefixer"),
        babel        = require("gulp-babel"),
        cleanCSS     = require("gulp-clean-css"),
        htmlmin      = require("gulp-htmlmin"),
        imagemin     = require("gulp-imagemin"),
        plumber      = require("gulp-plumber"),
        pngquant     = require("imagemin-pngquant"),
        gulpif       = require("gulp-if"),
        uncss        = require("gulp-uncss"),
        useref       = require("gulp-useref"),
        concat       = require("gulp-concat"),
        webp         = require("gulp-webp"),
        pug          = require("gulp-pug"),
        uglify       = require("gulp-uglify"),
        browserify   = require("gulp-browserify"),
        sass         = require("gulp-sass"),
        dir          = {
          src : "src",
          development : "build/development",
          production : "build/production",
          nm : "node_modules",
        },
        files        = {
          CSS : [
            '${dir.nm}/animate.css/source/animate.min.css',
            "css/main.css",
          ],
          mCSS : "main.min.css",
          JS : [
            '${dir.nm}/jquery/dist/jquery.min.js',
            "js/main.js",
          ],
          mJS : "main.min.js",
        },
        opts = {
          pug                 : {
            pretty            : true,
            locals            : {
              files           : files
            }
          },
          es6                 : { presets : ['es2015'] },
          sass                : { outputStyle : "compressed" },
          imagemin            : {
            progressive       : true,
            use               : [pngquant()]
          },
          svgmin              : {
            plugin            : [
              { convertColors : false },
              { removeAttrs   : { attrs : ["fill"] } }
            ]
          },
          uncss               : { html : ['${dir.development}/*.html'] },
          autoprefixer        : {
            browsers          : ["last 5 versions"],
            cascade           : false
          },
          htmlmin : {collapseWhitespace: true}
        };

// Task pug
gulp.task("pug", function(){
  return gulp.src("src/templates/**/*.pug")
  .pipe(plumber())
  .pipe(pug(opts.pug))
  .pipe(gulp.dest('${dir.development}'))
  .pipe(browserSync.reload({ stream : true }));
});

// Task JS
gulp.task("js", function() {
  return gulp.src("src/js/**.*js")
    .pipe(plumber())
        .pipe( babel(opts.es6) )
        .pipe( gulp.dest('${dir.development}/js') )
    .pipe(browserSync.reload({stream : true}));
});

// Task SASS
gulp.task("sass", function(){
  return gulp.src("src/sass/**/*.scss")
    .pipe(plumber())
    .pipe( sass(opts.sass) )
    .pipe(gulp.dest('${dir.development}/css'))
    .pipe(browserSync.reload({stream : true}));
});

// Task img
gulp.task('img', () => {
  return gulp.src( '${dir.src}/img/**/*.+(png|jpge|jpg|gif)' )
    .pipe( plumber() )
    .pipe( imagemin(opts.imagemin))
    .pipe( gulp.dest('${dir.development}/img') );
});

// Task imgprod
gulp.task('imgProduction', () => {
  return gulp.src( '${dir.development}/img/**/*.+(png|jpge|jpg|gif)' )
    .pipe( gulp.dest('${dir.production}/img') );
});

//task webp
gulp.task('webp', () => {
    return gulp.src( '${dir.src}/img/**/*.+(png|jpeg|jpg)' )
    .pipe(plumber())
        .pipe( webp() )
        .pipe( gulp.dest('${dir.development}/img/webp') );
});

//task webpProd
gulp.task('webpProduction', () => {
    return gulp.src( '${dir.development}/img/webp)' )
        .pipe( gulp.dest('${dir.production}/img/webp') );
});

//task svg
gulp.task("svg", () => {
  return gulp.src('${dir.src}/img/svg/*.svg')
  .pipe(plumber())
  .pipe( svgming(opts.svgmin) )
  .pipe( gulp.dest('${dir.development}/img/svg'));
});

//task svgProdu
gulp.task("svgProduction", () => {
  return gulp.src('${dir.development}/img/svg/*.svg')
  .pipe( gulp.dest('${dir.production}/img/svg'));
});

// ************AQUI ES DONDE ME MARCA EL ERROR <********************
gulp.task('css', () => {
    return gulp.src(files.CSS)
        .pipe( concat(files.mCSS) )
        .pipe( uncss(opts.uncss) )
        .pipe( autoprefixer(opts.autoprefixer) )
        .pipe( cleanCSS() )
        .pipe( gulp.dest('${dir.dist}/css') );
});

//task js
gulp.task("js", () => {
  return gulp.src(files.JS)
  .pipe( concat(files.mJS) )
  .pipe( uglify() )
  .pipe( gulp.dest('${dir.production}/js') );
});

//task html
gulp.task("html", () => {
  return gulp.src('${dir.development}/*.html')
  .pipe( useref() )
  .pipe( htmlmin(opts.htmlmin) )
  .pipe( gulp.dest('${dir.development}'));
});

// task watch
gulp.task("watch", () => {
  gulp.watch("src/templates/**/*.pug", ["pug"]);
  gulp.watch("src/js/**/*.js", ["js"]);
  gulp.watch("src/sass/**/*.scss", ["sass"]);
});

// task server
gulp.task("server", () => {
  browserSync.init({
    server: {
      baseDir: '${dir.development}',
      routes: {
        "/node_modules": '${dir.nm}',
        }
      }
  })
});


// Tareas que se ejecutan
gulp.task("default", ["pug", "js", "sass", "watch", "server"]);
gulp.task("images", ["img", "webp", "svg"]);
gulp.task("production", ["css", "js", "html", "imgProduction", "webpProduction"]);

The view is as follows:

<!DOCTYPE html>
html(lang="es")
head
  meta(charset="UTF-8")
  meta(name="viewport", content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0")
  title Rianjani
  // build:css css/estilos.min.css
  each css in files.CSS
    link(rel="stylesheet", href='${css}')
  // endbuild
body
  h1 Hola Mundo
  p error resuelto

  // build:js js/main.min.js
  each js in files.JS
    script(src='${js}')
  // endbuild

And the folder structure is as follows:

-build 
-- development 
--- img
--- sass 
--- js
--- index.html
-- production 
-node_modules
-src
-- img
-- sass 
-- js
-- templates

When I compile the production task to send everything to the production folder, it is when I get the error