Gatling CLI simulation class name question

I’m trying to run a gatling simulation from command line. When I run the command “C:\gatling\bin> .\gatling.ps1 -s REST SavedSearch.Basic.ManyUsers” shouldn’t it compile the specified class and execute it. At least that’s what i understood from the documentation page. What I see instead is that it compiles the whole test suite and still asks for simulation id. Can someone tell me if I’m doing anything wrong?

This is the command that I pass.
c:\Gatling\bin>.\gatling.bat -s Kepler.ServiceDiscovery.KeplerPingService.Warmup

This is the stack trace that I get.

You just have to read:

Caused by: io.gatling.core.session.el.ELParserException: Failed to parse null wi
th error ‘null’
at io.gatling.core.session.el.ELCompiler.parseEl(ELCompiler.scala:242)
at io.gatling.core.session.el.ELCompiler$.parse(ELCompiler.scala:172)
at io.gatling.core.session.el.ELCompiler$.compile(ELCompiler.scala:175)
at io.gatling.core.session.el.package$EL$.el$extension(package.scala:25)
at io.gatling.core.Predef$.stringToExpression(Predef.scala:46)
**at perftest.Helper$.(**Helpers.scala:26)
at perftest.Helper$.(Helpers.scala)

The error is in your code