This error can be caused when we are trying to connect to an occupied port.

One way to resolve this is to stop running softwares that may be using these ports, such as Apache.
But we can also solve this issue using another port that is probably available.
We can force Kool to do this by adding these constants to the end of the .env file in your project:
KOOL_APP_PORT=8080
KOOL_DATABASE_PORT=13306
Like this:
