Fail while using sbt assembly

[ariden83]

when we set "sbt assembly"

we've got this error :

[info] Loading project definition from /home/adrien/work/jpescalona/project
[info] Set current project to gatling-amqp (in build file:/home/adrien/work/jpescalona/)
[info] Compiling 49 Scala sources to /home/adrien/work/jpescalona/target/scala-2.11/classes...
[error] /home/adrien/work/jpescalona/src/main/scala/io/gatling/amqp/infra/Stats.scala:9: value statsEngine is not a member of io.gatling.amqp.config.AmqpProtocol
[error]   private lazy val statsEngine = amqp.statsEngine
[error]                                       ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 9 s, completed 27 avr. 2018 14:54:40

Note: I use "sbt assembly" because no one said how to use "amqp plugin" without assembly.