My apologies, this is the complete error description in the console of the IDEA:
"C:\Program Files\Java\jdk1.8.0_221\jre\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.2\lib\idea_rt.jar=34675:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_221\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar;C:\MyGatlingProjects\TheMercuryProject\target\test-classes;C:\MyGatlingProjects\TheMercuryProject\target\classes;C:\Users\Mishal\.ivy2\cache\org.scala-lang\scala-library\jars\scala-library-2.12.9.jar;C:\Users\Mishal\.ivy2\cache\org.scala-lang\scala-reflect\jars\scala-reflect-2.12.9.jar;C:\Users\Mishal\.ivy2\cache\org.scala-lang\scala-library\srcs\scala-library-2.12.9-sources.jar;C:\Users\Mishal\.ivy2\cache\org.scala-lang\scala-reflect\srcs\scala-reflect-2.12.9-sources.jar;C:\Users\Mishal\.m2\repository\io\gatling\highcharts\gatling-charts-highcharts\3.2.0\gatling-charts-highcharts-3.2.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-charts\3.2.0\gatling-charts-3.2.0.jar;C:\Users\Mishal\.m2\repository\com\tdunning\t-digest\3.1\t-digest-3.1.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-http-client\3.2.0\gatling-http-client-3.2.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-netty-util\3.2.0\gatling-netty-util-3.2.0.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-buffer\4.1.37.Final\netty-buffer-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-handler\4.1.37.Final\netty-handler-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-handler-proxy\4.1.37.Final\netty-handler-proxy-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-codec-socks\4.1.37.Final\netty-codec-socks-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-resolver-dns\4.1.37.Final\netty-resolver-dns-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-resolver\4.1.37.Final\netty-resolver-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-codec-dns\4.1.37.Final\netty-codec-dns-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-transport-native-epoll\4.1.37.Final\netty-transport-native-epoll-4.1.37.Final-linux-x86_64.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-transport-native-unix-common\4.1.37.Final\netty-transport-native-unix-common-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-codec-http2\4.1.37.Final\netty-codec-http2-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-tcnative-boringssl-static\2.0.25.Final\netty-tcnative-boringssl-static-2.0.25.Final.jar;C:\Users\Mishal\.m2\repository\com\sun\activation\javax.activation\1.2.0\javax.activation-1.2.0.jar;C:\Users\Mishal\.m2\repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar;C:\Users\Mishal\.m2\repository\com\typesafe\scala-logging\scala-logging_2.12\3.9.2\scala-logging_2.12-3.9.2.jar;C:\Users\Mishal\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\Mishal\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-commons\3.2.0\gatling-commons-3.2.0.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\scala-reflect\2.12.8\scala-reflect-2.12.8.jar;C:\Users\Mishal\.m2\repository\com\typesafe\config\1.3.4\config-1.3.4.jar;C:\Users\Mishal\.m2\repository\io\suzaku\boopickle_2.12\1.3.1\boopickle_2.12-1.3.1.jar;C:\Users\Mishal\.m2\repository\org\typelevel\spire-macros_2.12\0.16.2\spire-macros_2.12-0.16.2.jar;C:\Users\Mishal\.m2\repository\com\softwaremill\quicklens\quicklens_2.12\1.4.12\quicklens_2.12-1.4.12.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\modules\scala-java8-compat_2.12\0.9.0\scala-java8-compat_2.12-0.9.0.jar;C:\Users\Mishal\.m2\repository\com\eatthepath\fast-uuid\0.1\fast-uuid-0.1.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-app\3.2.0\gatling-app-3.2.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-core\3.2.0\gatling-core-3.2.0.jar;C:\Users\Mishal\.m2\repository\com\typesafe\akka\akka-slf4j_2.12\2.5.23\akka-slf4j_2.12-2.5.23.jar;C:\Users\Mishal\.m2\repository\org\simpleflatmapper\lightning-csv\7.0.0\lightning-csv-7.0.0.jar;C:\Users\Mishal\.m2\repository\org\simpleflatmapper\sfm-util\7.0.0\sfm-util-7.0.0-jdk9.jar;C:\Users\Mishal\.m2\repository\org\simpleflatmapper\sfm-util\7.0.0\sfm-util-7.0.0.jar;C:\Users\Mishal\.m2\repository\com\github\ben-manes\caffeine\caffeine\2.7.0\caffeine-2.7.0.jar;C:\Users\Mishal\.m2\repository\org\checkerframework\checker-qual\2.6.0\checker-qual-2.6.0.jar;C:\Users\Mishal\.m2\repository\com\google\errorprone\error_prone_annotations\2.3.3\error_prone_annotations-2.3.3.jar;C:\Users\Mishal\.m2\repository\io\pebbletemplates\pebble\3.0.10\pebble-3.0.10.jar;C:\Users\Mishal\.m2\repository\org\unbescape\unbescape\1.1.6.RELEASE\unbescape-1.1.6.RELEASE.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\modules\scala-parser-combinators_2.12\1.1.2\scala-parser-combinators_2.12-1.1.2.jar;C:\Users\Mishal\.m2\repository\com\github\scopt\scopt_2.12\3.7.1\scopt_2.12-3.7.1.jar;C:\Users\Mishal\.m2\repository\io\gatling\jsonpath_2.12\0.7.0\jsonpath_2.12-0.7.0.jar;C:\Users\Mishal\.m2\repository\net\sf\saxon\Saxon-HE\9.9.1-4\Saxon-HE-9.9.1-4.jar;C:\Users\Mishal\.m2\repository\org\jodd\jodd-lagarto\5.0.13\jodd-lagarto-5.0.13.jar;C:\Users\Mishal\.m2\repository\org\jodd\jodd-core\5.0.13\jodd-core-5.0.13.jar;C:\Users\Mishal\.m2\repository\org\jodd\jodd-log\5.0.13\jodd-log-5.0.13.jar;C:\Users\Mishal\.m2\repository\io\burt\jmespath-jackson\0.3.0\jmespath-jackson-0.3.0.jar;C:\Users\Mishal\.m2\repository\io\burt\jmespath-core\0.3.0\jmespath-core-0.3.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-http\3.2.0\gatling-http-3.2.0.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\modules\scala-xml_2.12\1.2.0\scala-xml_2.12-1.2.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-jms\3.2.0\gatling-jms-3.2.0.jar;C:\Users\Mishal\.m2\repository\javax\jms\javax.jms-api\2.0.1\javax.jms-api-2.0.1.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-jdbc\3.2.0\gatling-jdbc-3.2.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-redis\3.2.0\gatling-redis-3.2.0.jar;C:\Users\Mishal\.m2\repository\net\debasishg\redisclient_2.12\3.10\redisclient_2.12-3.10.jar;C:\Users\Mishal\.m2\repository\org\apache\commons\commons-pool2\2.6.0\commons-pool2-2.6.0.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-graphite\3.2.0\gatling-graphite-3.2.0.jar;C:\Users\Mishal\.m2\repository\org\hdrhistogram\HdrHistogram\2.1.11\HdrHistogram-2.1.11.jar;C:\Users\Mishal\.m2\repository\io\gatling\gatling-recorder\3.2.0\gatling-recorder-3.2.0.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\modules\scala-swing_2.12\2.1.1\scala-swing_2.12-2.1.1.jar;C:\Users\Mishal\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.9.1\jackson-databind-2.9.9.1.jar;C:\Users\Mishal\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\Mishal\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.9\jackson-core-2.9.9.jar;C:\Users\Mishal\.m2\repository\org\json4s\json4s-jackson_2.12\3.6.7\json4s-jackson_2.12-3.6.7.jar;C:\Users\Mishal\.m2\repository\org\json4s\json4s-core_2.12\3.6.7\json4s-core_2.12-3.6.7.jar;C:\Users\Mishal\.m2\repository\org\json4s\json4s-ast_2.12\3.6.7\json4s-ast_2.12-3.6.7.jar;C:\Users\Mishal\.m2\repository\org\json4s\json4s-scalap_2.12\3.6.7\json4s-scalap_2.12-3.6.7.jar;C:\Users\Mishal\.m2\repository\com\thoughtworks\paranamer\paranamer\2.8\paranamer-2.8.jar;C:\Users\Mishal\.m2\repository\org\bouncycastle\bcpkix-jdk15on\1.62\bcpkix-jdk15on-1.62.jar;C:\Users\Mishal\.m2\repository\org\bouncycastle\bcprov-jdk15on\1.62\bcprov-jdk15on-1.62.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-codec-http\4.1.37.Final\netty-codec-http-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-common\4.1.37.Final\netty-common-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-transport\4.1.37.Final\netty-transport-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\io\netty\netty-codec\4.1.37.Final\netty-codec-4.1.37.Final.jar;C:\Users\Mishal\.m2\repository\com\typesafe\akka\akka-actor_2.12\2.5.23\akka-actor_2.12-2.5.23.jar;C:\Users\Mishal\.m2\repository\org\scala-lang\scala-library\2.12.9\scala-library-2.12.9.jar" Engine
Choose a simulation number:
[0] ScriptEnhanced
[1] simulations.ScriptEnhanced
[2] test.scala.myGatlingScripts.firstScript
0
Select run description (optional)
uiop
09:59:42.472 [ERROR] i.g.a.Gatling$ - Run crashed
java.lang.UnsupportedClassVersionError: org/simpleflatmapper/util/ParallelReader has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.simpleflatmapper.lightningcsv.CsvParser.dsl(CsvParser.java:127)
at org.simpleflatmapper.lightningcsv.CsvParser.separator(CsvParser.java:107)
at io.gatling.core.feeder.SeparatedValuesParser$.stream(SeparatedValuesParser.scala:44)
at io.gatling.core.feeder.SeparatedValuesParser$.$anonfun$parse$1(SeparatedValuesParser.scala:39)
at io.gatling.core.feeder.SeparatedValuesParser$.parse(SeparatedValuesParser.scala:38)
at io.gatling.core.feeder.SeparatedValuesFeederSource.applyBatch$1(FeederSource.scala:130)
at io.gatling.core.feeder.SeparatedValuesFeederSource.feeder(FeederSource.scala:159)
at io.gatling.core.feeder.SourceFeederBuilder.apply(FeederBuilder.scala:76)
at io.gatling.core.feeder.SourceFeederBuilder.apply(FeederBuilder.scala:45)
at io.gatling.core.action.builder.FeedBuilder.newSingletonFeed(FeedBuilder.scala:38)
at io.gatling.core.action.builder.FeedBuilder.$anonfun$build$1(FeedBuilder.scala:43)
at scala.collection.mutable.MapLike.getOrElseUpdate(MapLike.scala:209)
at scala.collection.mutable.MapLike.getOrElseUpdate$(MapLike.scala:206)
at scala.collection.mutable.AbstractMap.getOrElseUpdate(Map.scala:82)
at io.gatling.core.action.builder.FeedBuilder.build(FeedBuilder.scala:43)
at io.gatling.core.structure.BuildAction.$anonfun$build$1(BuildAction.scala:25)
at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
at scala.collection.immutable.List.foldLeft(List.scala:89)
at io.gatling.core.structure.BuildAction.build(BuildAction.scala:24)
at io.gatling.core.structure.BuildAction.build$(BuildAction.scala:23)
at io.gatling.core.structure.ScenarioBuilder.build(ScenarioBuilder.scala:38)
at io.gatling.core.structure.PopulationBuilder.build(ScenarioBuilder.scala:101)
at io.gatling.core.scenario.SimulationParams.$anonfun$scenarios$1(Simulation.scala:192)
at scala.collection.immutable.List.map(List.scala:286)
at io.gatling.core.scenario.SimulationParams.scenarios(Simulation.scala:192)
at io.gatling.app.Runner.run0(Runner.scala:91)
at io.gatling.app.Runner.run(Runner.scala:60)
at io.gatling.app.Gatling$.start(Gatling.scala:73)
at io.gatling.app.Gatling$.fromMap(Gatling.scala:41)
at Engine$.delayedEndpoint$Engine$1(Engine.scala:11)
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/simpleflatmapper/util/ParallelReader has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.simpleflatmapper.lightningcsv.CsvParser.dsl(CsvParser.java:127)
at org.simpleflatmapper.lightningcsv.CsvParser.separator(CsvParser.java:107)
at io.gatling.core.feeder.SeparatedValuesParser$.stream(SeparatedValuesParser.scala:44)
at io.gatling.core.feeder.SeparatedValuesParser$.$anonfun$parse$1(SeparatedValuesParser.scala:39)
at io.gatling.core.feeder.SeparatedValuesParser$.parse(SeparatedValuesParser.scala:38)
at io.gatling.core.feeder.SeparatedValuesFeederSource.applyBatch$1(FeederSource.scala:130)
at io.gatling.core.feeder.SeparatedValuesFeederSource.feeder(FeederSource.scala:159)
at io.gatling.core.feeder.SourceFeederBuilder.apply(FeederBuilder.scala:76)
at io.gatling.core.feeder.SourceFeederBuilder.apply(FeederBuilder.scala:45)
at io.gatling.core.action.builder.FeedBuilder.newSingletonFeed(FeedBuilder.scala:38)
at io.gatling.core.action.builder.FeedBuilder.$anonfun$build$1(FeedBuilder.scala:43)
at scala.collection.mutable.MapLike.getOrElseUpdate(MapLike.scala:209)
at scala.collection.mutable.MapLike.getOrElseUpdate$(MapLike.scala:206)
at scala.collection.mutable.AbstractMap.getOrElseUpdate(Map.scala:82)
at io.gatling.core.action.builder.FeedBuilder.build(FeedBuilder.scala:43)
at io.gatling.core.structure.BuildAction.$anonfun$build$1(BuildAction.scala:25)
at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
at scala.collection.immutable.List.foldLeft(List.scala:89)
at io.gatling.core.structure.BuildAction.build(BuildAction.scala:24)
at io.gatling.core.structure.BuildAction.build$(BuildAction.scala:23)
at io.gatling.core.structure.ScenarioBuilder.build(ScenarioBuilder.scala:38)
at io.gatling.core.structure.PopulationBuilder.build(ScenarioBuilder.scala:101)
at io.gatling.core.scenario.SimulationParams.$anonfun$scenarios$1(Simulation.scala:192)
at scala.collection.immutable.List.map(List.scala:286)
at io.gatling.core.scenario.SimulationParams.scenarios(Simulation.scala:192)
at io.gatling.app.Runner.run0(Runner.scala:91)
at io.gatling.app.Runner.run(Runner.scala:60)
at io.gatling.app.Gatling$.start(Gatling.scala:73)
at io.gatling.app.Gatling$.fromMap(Gatling.scala:41)
at Engine$.delayedEndpoint$Engine$1(Engine.scala:11)