private void checkUnsupportedField(JsonNode jsonNode) {
			Iterator<Entry<String, JsonNode>> fields = jsonNode.fields();
			while (fields.hasNext()) {
				Entry<String, JsonNode> field = fields.next();
				String key = field.getKey();
				if (!isSupportedField(key)) {
					throw new InvalidGitHubConfigurationException("Field '" + key + "' isn't supported.\n" +
						"Please check your .gitconfig.yml");
				}
			}
		}
Check gitHub configuration has unsupported fields.

@throws InvalidGitHubConfigurationException occurs when unsupported field is exist.
ngrinder-controller/src/main/java/org/ngrinder/script/model/GitHubConfig.java