加特林 scala 扩展失败，无法找到证据参数的隐式值

尝试使用一种简洁的扩展方法来运行 gatling 3.0.2，我之前已经在 gatling 2.2.x 中多次使用过该方法

implicit class Extensions(val scenario: ScenarioBuilder) extends AnyVal {
def injectDefaults: PopulationBuilder =
  scenario.inject(
    rampUsersPerSec(RAMP_USER_PER_SEC) to LOAD_FACTOR during (RAMP_UP_TIME seconds),
    constantUsersPerSec(LOAD_FACTOR) during (DURATION seconds)
  )

}

但它不再编译，失败并显示：

 could not find implicit value for evidence parameter of type 
 io.gatling.core.controller.inject.InjectionProfileFactory[Product with Serializable with io.gatling.core.controller.inject.open.OpenInjectionStep]
  scenario.inject(

有人知道为什么吗？

我自己找到了解决方案，缺少一些隐式导入。这是完整的代码示例：

import io.gatling.core.Predef.{constantUsersPerSec, rampUsersPerSec,_}
import io.gatling.core.structure.{PopulationBuilder, ScenarioBuilder}

import scala.concurrent.duration._

object Config {    
  val LOAD_FACTOR: Double = 50
  var RAMP_UP_TIME: Int = 10
  val RAMP_USER_PER_SEC = 0.1


  implicit class Extensions(val scenario: ScenarioBuilder) {
    def injectDefaults: PopulationBuilder =
      scenario.inject(
        rampUsersPerSec(RAMP_USER_PER_SEC) to LOAD_FACTOR during (RAMP_UP_TIME seconds),
        constantUsersPerSec(LOAD_FACTOR) during (DURATION seconds)
      )
  }

}