SetUp not working anymore

My old script does not work (gives me red error) for this line of code:

setUp(scnVaretelling.inject(atOnceUsers(1)).protocols(httpProtocol))

Has the configuration of setUp changed over the last year? Have not used gatling in over a year.

Version of gatling: 2.3.0
Version of Scala: 2.12.13

Thanks!