human
Solve the following python programming problem given the following code:
@ task 
def doc_watch() : 
    'Watch for changes in the docs and rebuild HTML docs when changed.' 
    try : 
        from watchdog.events import FileSystemEventHandler 
        from watchdog.observers import Observer 
except ImportError : 
        print_failure_message ("Install the watchdog package to use this task, i.e., `pip install watchdog'.") 
        raise SystemExit (1) 
class RebuildDocsEventHandler (FileSystemEventHandler) : 
        def __init__(self, base_paths) : 
            self.base_paths = base_paths 
def dispatch(self, event) : 
            'Dispatches events to the appropriate methods.
            :param event: The event object representing the file system event.
            :type event: :class:`watchdog.events.FileSystemEvent`
            ' 
            for base_path in self.base_paths : 
                if event.src_path.endswith (base_path) : 
                    super (RebuildDocsEventHandler, self).dispatch (event) 
                    return 
def on_modified(self, event) : 
            print_failure_message ('Modification detected. Rebuilding docs.') 
            doc_html () 
            print_success_message ('Docs have been rebuilt.') 
print_success_message ('Watching for changes in project files, press Ctrl-C to cancel...') 
    handler = RebuildDocsEventHandler (get_project_files ()) 
    observer = Observer () 
    observer.schedule (observer, path = '.', recursive = True) 
    observer.start () 
    try : 
        while True : 
            time.sleep (1) 
except KeyboardInterrupt : 
        observer.stop () 
        observer.join () 

    
    

    Fix the buggy line: observer.schedule (observer, path = '.', recursive = True)
assistant
#Here is Python program to fix the buggy line: observer.

observer.schedule (handler, path = '.', recursive = True)