private void reportDuplicateKey(ThemeValue<?> oldValue, int lineNumber) {
		if (oldValue != null) {
			error(lineNumber, "Duplicate id found: \"" + oldValue.getId() + "\"");
		}
	}
Returns a list of errors found while parsing
@return a list of errors found while parsing
Ghidra/Framework/Gui/src/main/java/generic/theme/AbstractThemeReader.java