Install the dependencies and the package here
Run yamllint in a file Be careful the path directly after the -c is where is the config file of yamllint from the root directory you need to change it if you are in another directory
yamllint -c server/scratchy_server/config-yamllint.yaml path_to_file
Run yamllint in a directory Be careful the path directly after the -c is where is the config file of yamllint from the root directory you need to change it if you are in another directory
yamllint -c server/scratchy_server/config-yamllint.yaml path_to_directory/.
Check the meaning of the error here
And then change your files to respect yaml style guide