Could not parse input org.antlr.runtime.EarlyExitException: null

[Artgit]

I'm trying to parse the following:

Parser parser = new Parser();
List<DateGroup> groups = parser.parse("the day before next 10/11/2016");
for (DateGroup group : groups) {
	List dates = group.getDates();
}

but it fails with the following exception:

10:21:44.851 [main] DEBUG com.joestelmach.natty.Parser - Could not parse input
org.antlr.runtime.EarlyExitException: null
	at com.joestelmach.natty.generated.DateWalker.date_time_alternative(DateWalker.java:540)
	at com.joestelmach.natty.generated.DateWalker.parse(DateWalker.java:418)
	at com.joestelmach.natty.Parser.singleParse(Parser.java:220)
	at com.joestelmach.natty.Parser.parse(Parser.java:100)
	at com.joestelmach.natty.Parser.parse(Parser.java:67)
	at com.verata.pipeline.api.controller.task.NattyTest.main(NattyTest.java:12)