"Error: listen EADDRINUSE: address already in use" during firebase deploy

General
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firebase deploy

=== Deploying to ‘express-jozi-runner’…

i deploying functions, hosting
i functions: preparing codebase default for deployment
i functions: ensuring required API cloudfunctions.googleapis.com is enabled…
i functions: ensuring required API cloudbuild.googleapis.com is enabled…
i artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled…
:check_mark: artifactregistry: required API artifactregistry.googleapis.com is enabled
:check_mark: functions: required API cloudfunctions.googleapis.com is enabled
:check_mark: functions: required API cloudbuild.googleapis.com is enabled
i functions: Loading and analyzing source code for codebase default to determine what to deploy
Serving at port 8556

⨯ Failed to start server

Error: listen EADDRINUSE: address already in use 0.0.0.0:8556
at (Error: listen EADDRINUSE: address already in use 0.0.0.0:8556) {
code: ‘EADDRINUSE’,
errno: -98,
syscall: ‘listen’,
address: ‘0.0.0.0’,
port: 8556
}