eslint-plugin-only-warn return all rules as warning but still has an error in my application

Question

I want to set all rules as warning because I don't want to edit all the code section. I tried to use prettier plugin, but it has a lot of dotted, then I prefer to use eslint-plugin-only-warn instead. All the rules are return as warning, but my application is still crashed. How to prevent error returned after all warning?

This is my terminal error log.

[nodemon] starting `npm start`

> [email protected] start
> eslint --max-warnings=0 src && npm run babel-node


D:\GitHub Works\SE Scholarship Website Project\database-backend\src\Database.js
   24:7    warning  'RegisterError' is defined but never used      no-unused-vars
  135:14   warning  'result' is defined but never used             no-unused-vars
  153:15   warning  'filename' is assigned a value but never used  no-unused-vars
  176:10   warning  'result' is defined but never used             no-unused-vars
  186:13   warning  'filename' is assigned a value but never used  no-unused-vars
  198:10   warning  'result' is defined but never used             no-unused-vars
  215:155  warning  'result' is defined but never used             no-unused-vars
  225:13   warning  'filename' is assigned a value but never used  no-unused-vars

D:\GitHub Works\SE Scholarship Website Project\database-backend\src\index.js
   82:24  warning  'err' is defined but never used  no-unused-vars
  152:26  warning  'req' is defined but never used  no-unused-vars
  152:30  warning  'res' is defined but never used  no-unused-vars

✖ 11 problems (0 errors, 11 warnings)

ESLint found too many warnings (maximum: 0).
[nodemon] app crashed - waiting for file changes before starting...

And my package.json settings.

{
  "name": "database-backend",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "babel-node": "babel-node src/index.js",
    "fix": "eslint src --fix",
    "start": "eslint --max-warnings=0 src && npm run babel-node",
    "dev": "nodemon --exec npm start"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt": "^5.0.1",
    "body-parser": "^1.19.2",
    "cookie-parser": "^1.4.6",
    "cors": "^2.8.5",
    "email-validator": "^2.0.4",
    "express": "^4.17.3",
    "express-fileupload": "^1.3.1",
    "express-session": "^1.17.2",
    "express-validator": "^6.14.0",
    "multer": "^1.4.4",
    "mysql": "^2.18.1"
  },
  "devDependencies": {
    "@babel/cli": "^7.17.6",
    "@babel/core": "^7.17.8",
    "@babel/eslint-parser": "^7.17.0",
    "@babel/node": "^7.16.8",
    "@babel/preset-env": "^7.16.11",
    "eslint-plugin-only-warn": "^1.0.3",
    "husky": "^7.0.4",
    "nodemon": "^2.0.15"
  },
  "eslintConfig": {
    "extends": [
      "eslint:recommended"
    ],
    "plugins": [
      "only-warn"
    ],
    "parser": "@babel/eslint-parser",
    "env": {
      "es6": true,
      "browser": true
    }
  },
  "babel": {
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "node": "current"
          }
        }
      ]
    ]
  },
  "browserslist": "> 0.25%, not dead"
}