como consertar esse erro no código? O que falta?

Error: function crashed. Details: list_gcs_objs() missing 1 required positional argument: ‘prefix

def list_gcs_objs(self, bucket, prefix):     storage_client = storage.Client()     bucket_check = storage_client.get_bucket(bucket)     blob_list = list(bucket_check.list_blobs(prefix=prefix))     obj_paths = list()     if len(blob_list) <= 1:         print("Folder empty\n")         return obj_paths     else:         count = 1     while count < len(blob_list):         obj_paths.append(blob_list[count].name)         count += 1     return obj_paths   def upload_to_gcs(bucket, object_key, data):     storage_client = storage.Client(bucket)     bucket_up = storage_client.get_bucket(bucket)     blob_up = bucket_up.blob(object_key)     response = blob_up.upload_from_string(data)     return (response)