运行加特林负载测试中的异常

Question

我正在使用加特林在本地计算机上进行负载测试。我正在使用具有以下依赖项的gradle：

io.gatling:gatling-app:2.1.7
io.gatling.highcharts:gatling-charts-highcharts:2.1.7

但是我遇到了错误-

[ERROR] [05/30/2019 20:53:41.904] [GatlingSystem-akka.actor.default- 
dispatcher-4] [akka://GatlingSystem/user/controller] null
java.lang.NullPointerException
    at io.gatling.http.action.HttpRequestActionBuilder.build(HttpRequestActionBuilder.scala:35)
    at io.gatling.core.structure.StructureBuilder$$anonfun$build$1.apply(StructureBuilder.scala:35)
    at io.gatling.core.structure.StructureBuilder$$anonfun$build$1.apply(StructureBuilder.scala:34)
    at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)
    at scala.collection.immutable.List.foldLeft(List.scala:84)
    at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:34)
    at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)
    at io.gatling.core.action.builder.LoopBuilder.build(LoopBuilder.scala:43)
    at io.gatling.core.structure.StructureBuilder$$anonfun$build$1.apply(StructureBuilder.scala:35)
    at io.gatling.core.structure.StructureBuilder$$anonfun$build$1.apply(StructureBuilder.scala:34)
    at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)
    at scala.collection.immutable.List.foldLeft(List.scala:84)