# Simulation compilation failed. **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [June 20, 2018, 6:18pm UTC](https://community.gatling.io/t/simulation-compilation-failed/4382 "2018-06-20T18:18:56Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Sanhita\_bs](https://avatars.discourse-cdn.com/v4/letter/s/3be4f8/32.png) [@Sanhita\_bs](https://community.gatling.io/u/Sanhita_bs)\ **Post date:** [June 20, 2018, 6:18pm UTC](https://community.gatling.io/t/simulation-compilation-failed/4382/1 "2018-06-20T18:18:56Z")
I get the following error when i execute the cmd mvn clean gatling:execute. java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at io.gatling.mojo.MainWithArgsInFile.runMain(MainWithArgsInFile.java:50) at io.gatling.mojo.MainWithArgsInFile.main(MainWithArgsInFile.java:33) Caused by: java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory at io.gatling.compiler.ZincCompiler$delayedInit$body.apply(ZincCompiler.scala:35) 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:33) at io.gatling.compiler.ZincCompiler.main(ZincCompiler.scala) … 6 more Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) … 16 more 2102 [INFO] ------------------------------------------------------------------------ 2103 [INFO] BUILD FAILURE 2103 [INFO] ------------------------------------------------------------------------ 2103 [INFO] Total time: 1.426 s 2104 [INFO] Finished at: 2018-06-20T14:15:01-04:00 2104 [INFO] ------------------------------------------------------------------------ 2105 [ERROR] Failed to execute goal io.gatling:gatling-maven-plugin:2.1.1:execute (default-cli) on project performance\_test: Gatling failed.: Simulations compilation failed. Process exited with an error: 255 (Exit value: 255) → [Help 1] 2105 [ERROR] 2106 [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. 2106 [ERROR] Re-run Maven using the -X switch to enable full debug logging. 2106 [ERROR] 2106 [ERROR] For more information about the errors and possible solutions, please read the following articles: 2106 [ERROR] [Help 1] [http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException](http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException) My pom file has \2.1.2\ \3.2.0\ and io.gatling gatling-maven-plugin 2.1.1 true Please help!