Hi Phil,
the message reports a token is missing from your source code and the parser reached the end of file ("EOF") without finding a required repeatable token ("(...)+"): I know error reporting is poorly implemented in the plugin and I'm working on that.
With regards to your specific issue I can't say much about a fix without seeing your feature file, but usually it is due to either a Scenario Outline section missing an Examples section followed by a table.
If this is not your case please provide the offending feature file and if there's a bug we'll identify the solution.