# Simulation failure error **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [September 27, 2021, 6:10am UTC](https://community.gatling.io/t/simulation-failure-error/6265 "2021-09-27T06:10:03Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Sasivarnan\_Manickam](https://avatars.discourse-cdn.com/v4/letter/s/df788c/32.png) [@Sasivarnan\_Manickam](https://community.gatling.io/u/Sasivarnan_Manickam)\ **Post date:** [September 27, 2021, 6:10am UTC](https://community.gatling.io/t/simulation-failure-error/6265/1 "2021-09-27T06:10:03Z")
Hi Team, I am working on a performance testing sample using gatling and getting the below error. Attached my pom. Could you please assist on this issue? C:\sasi\IdeaProjects\gatling-testing\>mvn clean gatling:execute [INFO] Scanning for projects… [INFO] [INFO] --------------------\< com.example:gatling-testing \>--------------------- [INFO] Building demo 0.0.1-SNAPSHOT [INFO] --------------------------------[jar]--------------------------------- [INFO] [INFO] — maven-clean-plugin:2.5:clean (default-clean) @ gatling-testing — [INFO] Deleting C:\sasi\IdeaProjects\gatling-testing\target [INFO] [INFO] — gatling-maven-plugin:2.2.3:execute (default-cli) @ gatling-testing — 01:44:50,215 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 01:44:50,215 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml] 01:44:50,215 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [jar:file:/C:/Users/makes/.m2/repository/io/gatling/gatling-maven-plugin/2.2.3/gatling-maven-plugin-2.2.3.jar!/logback.xml] 01:44:50,231 |-INFO in ch.qos.logback.core.joran.spi.ConfigurationWatchList@57c03d88 - URL [jar:file:/C:/Users/makes/.m2/repository/io/gatling/gatling-maven-plugin/2.2.3/gatling-maven-plugin-2.2.3.jar!/logback.xml] is not of type file 01:44:50,339 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set 01:44:50,366 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 01:44:50,373 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [CONSOLE] 01:44:50,378 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@5:19 - no applicable action for [immediateFlush], current ElementPath is [[configuration][appender][immediateFlush]] 01:44:50,379 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 01:44:50,442 |-INFO in ch.qos.logback.classic.joran.action.LevelAction - ROOT level set to WARN 01:44:50,442 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [CONSOLE] to Logger[ROOT] 01:44:50,442 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration. 01:44:50,442 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@16aa8654 - Registering current configuration as safe fallbjava.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ack point at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at io.gatling.mojo.MainWithArgsInFile.runMain(MainWithArgsInFile.java:50) at io.gatling.mojo.MainWithArgsInFile.main(MainWithArgsInFile.java:33) Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader ‘bootstrap’) at io.gatling.compiler.ZincCompiler$delayedInit$body.apply(ZincCompiler.scala:56) at scala.Function0$class.apply$mcV$sp(Function0.scala:40) at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12) at scala.App$$anonfun$main$1.apply(App.scala:71) at scala.App$$anonfun$main$1.apply(App.scala:71) at scala.collection.immutable.List.foreach(List.scala:318) at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:32) at scala.App$class.main(App.scala:71) at io.gatling.compiler.ZincCompiler$.main(ZincCompiler.scala:36) at io.gatling.compiler.ZincCompiler.main(ZincCompiler.scala) … 6 more [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.744 s [INFO] Finished at: 2021-09-27T01:44:50-04:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal io.gatling:gatling-maven-plugin:2.2.3:execute (default-cli) on project gatling-testing: Gatling failed.: Simulations compilation failed. Process exited with an error: -1 (Exit value: -1) → [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] [http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException](http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException) Thanks [pom.xml](https://community.gatling.io/uploads/short-url/1lgRtMGv9gsZP0ynL07eUxoJo2x.xml) (4.02 KB) ---
**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\ **Post date:** [September 27, 2021, 6:08am UTC](https://community.gatling.io/t/simulation-failure-error/6265/2 "2021-09-27T06:08:09Z")
You’re using Gatling 2 that was terminated several years ago. There’s no way to help you with such an old version. Please upgrade to Gatling 3 (the latest version is 3.6.1).