CrossValidator tools argument parser not working with minimun arguments

The minimun arguments to run a cross validator tool from command line are "lang" and "data", but using only these causes an exception:

$ bin/opennlp SentenceDetectorCrossValidator -lang pt -data sent.txt
Exception in thread "main" java.lang.IllegalArgumentException: Passed args must be valid!
at opennlp.tools.cmdline.ArgumentParser.parse(ArgumentParser.java:385)
at opennlp.tools.cmdline.AbstractTrainerTool.run(AbstractTrainerTool.java:46)
at opennlp.tools.cmdline.sentdetect.SentenceDetectorCrossValidatorTool.run(SentenceDetectorCrossValidatorTool.java:49)
at opennlp.tools.cmdline.CLI.main(CLI.java:212)