grunt clean error?

Question

Grunt.js

"use strict";

module.exports = function(grunt) {
  grunt.loadNpmTasks("grunt-browser-sync");
  grunt.loadNpmTasks("grunt-contrib-watch");
  grunt.loadNpmTasks("grunt-postcss");
  grunt.loadNpmTasks("grunt-sass");
  grunt.loadNpmTasks('grunt-contrib-copy');
  grunt.loadNpmTasks('grunt-contrib-clean');

  grunt.initConfig({
    sass: {
      style: {
        files: {
          "css/style.css": "sass/style.scss"
        }
      }
    },

      copy: {
      build: { 
        files: [{ 
          expand: true,
          src: [
            "fonts/**/*.{woff, woff2}",
            "img/**",
            "js/**",
            "*.html"
          ],
          dest: "build"
        }]
      }
    },
      
      сlean: {
      build: ["build"]
    },
      
    postcss: {
      style: {
        options: {
          processors: [
            require("autoprefixer")({browsers: [
              "last 1 version",
              "last 2 Chrome versions",
              "last 2 Firefox versions",
              "last 2 Opera versions",
              "last 2 Edge versions"
            ]})
          ]
        },
        src: "css/*.css"
      }
    },

    browserSync: {
      server: {
        bsFiles: {
          src: [
            "*.html",
            "css/*.css"
          ]
        },
        options: {
          server: ".",
          watchTask: true,
          notify: false,
          open: true,
          ui: false
        }
      }
    },

    watch: {
      style: {
        files: ["sass/**/*.{scss,sass}"],
        tasks: ["sass", "postcss"],
        options: {
          spawn: false
        }
      }
    }
  });

  grunt.registerTask("serve", ["browserSync", "watch"]);
  grunt.registerTask("build", [
    "clean",
    "copy",
    "sass",
    "postcss",
    "csso",
    "imagemin"
  ]);
};

Hello everyone, plz tell me, in the console I use the grunt clean command and instead of executing I get "No "clean" targets found." The task is installed, the simplest configuration is written, but the problem remains, how can I solve it?