Map<?, ?> input;
try {
input = (Map<?, ?>) yaml.load(contents);
} catch (YAMLException e) {
throw new InvalidConfigurationException(e);
} catch (ClassCastException e) {
throw new InvalidConfigurationException("Top level is not a Map.");
}
String header = parseHeader(contents);
if (header.length() > 0) {
options().header(header);