unable to deploy in docker

[LaserTower]

bookstack_1 | wait-for-db: waiting for bookstack_db:3306
bookstack_1 | bash: line 2: syntax error near unexpected token do' bookstack_1 | bash: line 2: do sleep 1;'
dispatcher_bookstack_1 exited with code 2

docker-compose.yml

version: '3.5'
services:
bookstack:
image: solidnerd/bookstack
environment:
DB_HOST: bookstack_db:3306
DB_DATABASE: bookstack
DB_USERNAME: bookstack
DB_PASSWORD: secret
APP_URL: http://diagrams
depends_on:
- bookstack_db

bookstack_db:
image: mysql:5.7.21
volumes:
- bookstack_mysql_data:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: secret
MYSQL_DATABASE: bookstack
MYSQL_USER: bookstack
MYSQL_PASSWORD: secret

volumes:
bookstack_mysql_data:
driver: local