gatling project setup error in intellij IDEA


please find attached pom.xml and error in IDE.

I created project using the command line -

mvn archetype:generate \

Imported project to IDE using File->new->project from existing sources using maven.

I created a simple simulaton script. But while running the Engine, getting following error. 
I make sure that 2.0.0-M3a gatling libraries available in external libraries. 
Would you please let me know the missing thing here..

Error:(23, 19) not found: value atOnceUsers


pom.xml (2.89 KB)