value param is not a member of io.gatling.http.request.builder.HttpRequestWithParamsBuilder

I use Gatling 2.0.0.

My Scala script is very simple and looks like this:

param has been renamed into formParam: http://gatling.io/docs/2.0.0-RC3/project/migration_guides/2.0.0-M3a-to-2.0.0-RC3.html#form-parameters-for-post-requests