Can't install 2nd instance of WordPress as it says Cannot start service db: OCI runtime create failed: container with id

Open Source Projects Compose
1

Hello,
I am new to docker and have been able to run WordPress using docker-compose.yml file. But the problem is, I want to install another WordPress and run 2 or more WordPress instance at the same time and it shows the error as below:

zoynul@zoynul:~/www/cutekid$ sudo docker-compose up
Starting cutekid_db_1 ... error

ERROR: for cutekid_db_1  Cannot start service db: OCI runtime create failed: container with id exists: 4e67f6f258bd04c62efe790c7508fedd5fee4d299078c68637f8c75cb9c4cad2: unknown

ERROR: for db  Cannot start service db: OCI runtime create failed: container with id exists: 4e67f6f258bd04c62efe790c7508fedd5fee4d299078c68637f8c75cb9c4cad2: unknown
ERROR: Encountered errors while bringing up the project.
zoynul@zoynul:~/www/cutekid$

docker-compose.yml that runs fine:

version: '3.3'
services:
  db:
image: mysql:5.7
volumes:
  - db_data:/var/lib/mysql
restart: always
environment:
  MYSQL_ROOT_PASSWORD: somewordpress
  MYSQL_DATABASE: wordpress
  MYSQL_USER: wordpress
  MYSQL_PASSWORD: wordpress
networks: 
  - back
  phpmyadmin:
depends_on:
  - db
image: phpmyadmin/phpmyadmin
restart: always
ports:
  - 8080:80
environment: 
  PMA_HOST: db
  MYSQL_ROOT_PASSWORD: somewordpress
networks:
  - back
  wordpress:
depends_on:
  - db
image: wordpress:latest
# build: 
#   context: .
#   dockerfile: ./build/Dockerfile
ports:
  - "80:80"
restart: always
volumes: 
    # - .:/var/www/html
  - ./wp-content:/var/www/html/wp-content
  # - ./wp-config.php:/var/www/html/wp-config.php
environment:
  # WORDPRESS_TABLE_PREFIX: ck_
  WORDPRESS_DB_HOST: db:3306
  WORDPRESS_DB_USER: wordpress
  WORDPRESS_DB_PASSWORD: wordpress
networks: 
  - back
networks: 
  back:
volumes:
db_data: {}

But this one generates the error:

version: '3.3'
services:
  db:
    image: mysql:5.7
    # ports: 8081:3306
    volumes:
      - ./mysql:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: somewordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    networks: 
      - back
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - 8082:80
    environment: 
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: somewordpress
    networks:
      - back
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    # build: 
    #   context: .
    #   dockerfile: ./build/Dockerfile
    ports:
      - 8083:90
    restart: always
    volumes: 
        # - .:/var/www/html
      - ./wp-content:/var/www/html/wp-content
      # - ./wp-config.php:/var/www/html/wp-config.php
    environment:
      # WORDPRESS_TABLE_PREFIX: ck_
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
    networks: 
      - back
networks: 
  back:
volumes:
    db_data: {}

Any help is highly appreciated.

Thanks