Problems with -ro option

When I define a new directory and I point gatling to use it
got this error:

bin/gatling.sh -sf user-files/simulations -ro gino -m
GATLING_HOME is set to XXXXXX/search-loadtest
Parsing log file(s)…
Exception in thread “main” java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at io.gatling.core.result.reader.DataReader$.newInstance(DataReader.scala:31)
at io.gatling.app.Gatling.start(Gatling.scala:77)
at io.gatling.app.Gatling$.fromArgs(Gatling.scala:59)
at io.gatling.app.Gatling$.main(Gatling.scala:44)
at io.gatling.app.Gatling.main(Gatling.scala)
Caused by: java.lang.IllegalArgumentException: requirement failed: simulation directory doesn’t contain any log file.
at scala.Predef$.require(Predef.scala:219)
at io.gatling.charts.result.reader.FileDataReader.(FileDataReader.scala:57)
… 9 more

Where gino is the name of the directory under results

Am I doing something wrong?
Thanks
Cheers,

Luca