default CommandInterruptException generateException(int missingArgumentIndex) {
        return new CommandInterruptException("&cArgument at index " + missingArgumentIndex + " is missing.");
    }
Generates a {@link CommandInterruptException} for when parsing fails due to the lack of an argument.

@param missingArgumentIndex the missing argument index
@return the exception
helper/src/main/java/me/lucko/helper/command/argument/ArgumentParser.java