@pitaj
The plugin was indeed in the dependencies section even though it was not installed on my nodeBB instance, weird.
Removing it has fixed the error. Thank you so much for your help
Here's how the package.json file looked like:
{
  "name": "nodebb",
  "license": "GPL-3.0",
  "description": "NodeBB Forum",
  "version": "1.16.1",
  "homepage": "http://www.nodebb.org",
  "repository": {
    "type": "git",
    "url": "https://github.com/NodeBB/NodeBB/"
  },
  "main": "app.js",
  "scripts": {
    "start": "node loader.js",
    "lint": "npx eslint --cache ./nodebb .",
    "test": "npx nyc --reporter=html --reporter=text-summary npx mocha",
    "coverage": "nyc report --reporter=text-lcov > ./coverage/lcov.info",
    "coveralls": "nyc report --reporter=text-lcov | coveralls && rm -r coverage"
  },
  "husky": {
    "hooks": {
      "pre-commit": "npx lint-staged",
      "commit-msg": "npx commitlint -E HUSKY_GIT_PARAMS"
    }
  },
  "lint-staged": {
    "*.js": [
      "eslint --fix",
      "git add"
    ]
  },
  "dependencies": {
    "@adactive/bootstrap-tagsinput": "^0.8.2",
    "@nodebb/bootswatch": "3.4.2",
    "ace-builds": "^1.4.9",
    "archiver": "^5.0.0",
    "async": "^3.2.0",
    "autoprefixer": "10.2.0",
    "bcryptjs": "2.4.3",
    "benchpressjs": "2.4.0",
    "body-parser": "^1.19.0",
    "bootbox": "4.4.0",
    "bootstrap": "^3.4.1",
    "chart.js": "^2.9.3",
    "cli-graph": "^3.2.2",
    "clipboard": "^2.0.6",
    "colors": "^1.4.0",
    "commander": "^6.0.0",
    "compare-versions": "3.6.0",
    "compression": "^1.7.4",
    "connect-ensure-login": "^0.1.1",
    "connect-flash": "^0.1.1",
    "connect-mongo": "3.2.0",
    "connect-multiparty": "^2.2.0",
    "connect-pg-simple": "^6.1.0",
    "connect-redis": "5.0.0",
    "cookie-parser": "^1.4.5",
    "cron": "^1.8.2",
    "cropperjs": "^1.5.6",
    "csurf": "^1.11.0",
    "daemon": "^1.1.0",
    "diff": "^5.0.0",
    "express": "^4.17.1",
    "express-session": "^1.17.0",
    "express-useragent": "^1.0.13",
    "graceful-fs": "^4.2.3",
    "helmet": "^4.0.0",
    "html-to-text": "6.0.0",
    "ipaddr.js": "^2.0.0",
    "jquery": "3.5.1",
    "jquery-deserialize": "2.0.0-rc1",
    "jquery-form": "4.3.0",
    "jquery-serializeobject": "1.0.0",
    "jquery-ui": "1.12.1",
    "jsesc": "3.0.2",
    "json2csv": "5.0.5",
    "jsonwebtoken": "^8.5.1",
    "less": "^3.11.1",
    "lodash": "^4.17.15",
    "logrotate-stream": "^0.2.6",
    "lru-cache": "6.0.0",
    "material-design-lite": "^1.3.0",
    "mime": "^2.4.4",
    "mkdirp": "^1.0.4",
    "mongodb": "3.6.3",
    "morgan": "^1.10.0",
    "mousetrap": "^1.6.5",
    "nconf": "^0.11.0",
    "nodebb-plugin-composer-default": "6.5.5",
    "nodebb-plugin-dbsearch": "4.1.2",
    "nodebb-plugin-emoji": "^3.3.0",
    "nodebb-plugin-emoji-android": "2.0.0",
    "nodebb-plugin-gamification": "^1.0.1",
    "nodebb-plugin-markdown": "8.12.4",
    "nodebb-plugin-mentions": "2.13.6",
    "nodebb-plugin-question-and-answer": "^0.7.7",
    "nodebb-plugin-require": "0.0.6",
    "nodebb-plugin-seo": "^1.0.0",
    "nodebb-plugin-seo-slug-friendly": "0.0.8",
    "nodebb-plugin-seo-thread": "^0.1.10",
    "nodebb-plugin-soundpack-default": "1.0.0",
    "nodebb-plugin-spam-be-gone": "0.7.7",
    "nodebb-rewards-essentials": "0.1.4",
    "nodebb-theme-lavender": "5.0.17",
    "nodebb-theme-persona": "10.3.17",
    "nodebb-theme-slick": "1.3.7",
    "nodebb-theme-vanilla": "11.3.10",
    "nodebb-widget-essentials": "5.0.2",
    "nodemailer": "^6.4.6",
    "nprogress": "0.2.0",
    "passport": "^0.4.1",
    "passport-http-bearer": "^1.0.1",
    "passport-local": "1.0.0",
    "pg": "^8.0.2",
    "pg-cursor": "^2.1.9",
    "postcss": "8.1.10",
    "postcss-clean": "1.1.0",
    "promise-polyfill": "^8.1.3",
    "prompt": "^1.0.0",
    "redis": "3.0.2",
    "request": "2.88.2",
    "request-promise-native": "^1.0.8",
    "requirejs": "2.3.6",
    "rimraf": "3.0.2",
    "rss": "^1.2.2",
    "sanitize-html": "^2.0.0",
    "semver": "^7.2.1",
    "serve-favicon": "^2.5.0",
    "sharp": "0.27.0",
    "sitemap": "^6.1.0",
    "slideout": "1.0.1",
    "socket.io": "3.0.5",
    "socket.io-adapter-cluster": "^1.0.1",
    "socket.io-client": "3.0.5",
    "socket.io-redis": "6.0.1",
    "sortablejs": "1.10.2",
    "spdx-license-list": "^6.1.0",
    "spider-detector": "2.0.0",
    "textcomplete": "^0.17.1",
    "textcomplete.contenteditable": "^0.1.1",
    "timeago": "^1.6.7",
    "tinycon": "0.6.8",
    "toobusy-js": "^0.5.1",
    "uglify-es": "^3.3.9",
    "validator": "13.5.2",
    "visibilityjs": "2.0.2",
    "winston": "3.3.3",
    "xml": "^1.0.1",
    "xregexp": "^4.3.0",
    "zxcvbn": "^4.4.2"
  },
  "devDependencies": {
    "@apidevtools/swagger-parser": "10.0.2",
    "@commitlint/cli": "11.0.0",
    "@commitlint/config-angular": "11.0.0",
    "coveralls": "3.1.0",
    "eslint": "7.17.0",
    "eslint-config-airbnb-base": "14.2.1",
    "eslint-plugin-import": "2.22.1",
    "grunt": "1.3.0",
    "grunt-contrib-watch": "1.1.0",
    "husky": "4.3.6",
    "jsdom": "16.4.0",
    "lint-staged": "10.5.3",
    "mocha": "8.2.1",
    "mocha-lcov-reporter": "1.3.0",
    "nyc": "15.1.0",
    "smtp-server": "3.8.0"
  },
  "bugs": {
    "url": "https://github.com/NodeBB/NodeBB/issues"
  },
  "engines": {
    "node": ">=10"
  },
  "maintainers": [
    {
      "name": "Andrew Rodrigues",
      "email": "andrew@nodebb.org",
      "url": "https://github.com/psychobunny"
    },
    {
      "name": "Julian Lam",
      "email": "julian@nodebb.org",
      "url": "https://github.com/julianlam"
    },
    {
      "name": "Barış Soner Uşaklı",
      "email": "baris@nodebb.org",
      "url": "https://github.com/barisusakli"
    }
  ],
  "nyc": {
    "exclude": [
      "src/upgrades/*",
      "test/*"
    ]
  }
}
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