Deployment Heroku节点部署错误&；postgresql

我试图使用heroku进行部署，但出现以下错误：

整数类型的输入语法无效：“favicon.ico”

我一直在寻找信息，但据我所知，这与我分配给数据库的数据类型有关吗

database.sql：

-- CREATE DATABASE freenutrition;

--\c food

CREATE TABLE food (
    food_id SERIAL PRIMARY KEY,
    name VARCHAR(25),
    type VARCHAR(20),
    weight_int int,
    prot real,
    lip real,
    hc real,
    n_int_card int,
    img_link VARCHAR(200)
);

db.js

package.json

{
  "name": "backend-freenutrition",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "engines": {
    "node": "15.8.0",
    "npm": "7.5.1"
  },
  "scripts": {
    "start": "node index.js"
  },
  "author": "JGP",
  "license": "ISC",
  "dependencies": {
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "pg": "^8.5.1"
  }
}

index.js（路由之一）

{
  "name": "backend-freenutrition",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "engines": {
    "node": "15.8.0",
    "npm": "7.5.1"
  },
  "scripts": {
    "start": "node index.js"
  },
  "author": "JGP",
  "license": "ISC",
  "dependencies": {
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "pg": "^8.5.1"
  }
}

//ROUTES//

//create a food

app.post("/", async (req, res) => {
  try {
    const { name, type, weight_int, prot, lip, hc, n_int_card, img_link } = req.body;
    const newFood = await pool.query(
      "INSERT INTO food (name, type, weight_int, prot, lip, hc, n_int_card, img_link) VALUES($1,$2,$3,$4,$5,$6,$7,$8) RETURNING *",
      [name, type, weight_int, prot, lip, hc, n_int_card, img_link]
    );

    res.json(newFood.rows[0]);
  } catch (err) {
    console.log(err.message);
  }
});

//get all foods

app.get("/", async (req, res) => {
  try {
    const allFoods = await pool.query("SELECT * FROM food");
    res.json(allFoods.rows);
  } catch (err) {
    console.error(err.message);
  }
});

```