+ try:
+ cfg = arvados.config.load(config_file)
+ except (IOError, OSError) as e:
+ abort(("Could not open config file {}: {}\n" +
+ "You must make sure that your configuration tokens\n" +
+ "for Arvados instance {} are in {} and that this\n" +
+ "file is readable.").format(
+ config_file, e, instance_name, config_file))