Gatling Quickstart Example: There is no simulation script

I’m going through the example provided on the Quickstart page ( I was able to run the script and I see my simulation in $GATLING_HOME/user-files/simulations/computerdatabase/BasicSimulation.scala

When I try to run $GATLING_HOME/bin/, I get the message: There is no simulation script. Please check that your scripts are in user-files/simulations

Can someone explain what’s happening and what I need to fix to get this working?