As a user, if I provide a path to a file that does not exist or is not a valid audio format, I want the utility to display an informative error message, so that I can correct my input.
Acceptance Criteria: An error message such as "Error: Input file not found or unsupported audio format." is shown.
As a user, if I provide a path to a file that does not exist or is not a valid audio format, I want the utility to display an informative error message, so that I can correct my input.
Acceptance Criteria: An error message such as "Error: Input file not found or unsupported audio format." is shown.