"Run tests for current project" isn't working

I am using this plugin to learn Java on IntelliJ. If I want to run tests with the Eye symbole, the Plugin throws this Exception out:
java.lang.NoClassDefFoundError: org/apache/maven/shared/invoker/MavenInvocationException at fi.helsinki.cs.tmc.langs.java.maven.MavenExecutors.tryAndExec(MavenExecutors.java:16) at fi.helsinki.cs.tmc.langs.java.maven.MavenPlugin.build(MavenPlugin.java:78) at fi.helsinki.cs.tmc.langs.java.AbstractJavaPlugin.runTests(AbstractJavaPlugin.java:136) at fi.helsinki.cs.tmc.langs.util.TaskExecutorImpl.runTests(TaskExecutorImpl.java:39) at fi.helsinki.cs.tmc.core.commands.RunTests.call(RunTests.java:40) at fi.helsinki.cs.tmc.core.commands.RunTests.call(RunTests.java:19) at fi.helsinki.cs.tmc.core.utilities.ExceptionTrackingCallable.call(ExceptionTrackingCallable.java:39) at fi.helsinki.cs.tmc.intellij.services.TestRunningService.lambda$prepareThreadForRunningTests$0(TestRunningService.java:68) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:183) at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:705) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:647) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:63) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:170) at fi.helsinki.cs.tmc.intellij.services.ThreadingService.lambda$runWithNotification$0(ThreadingService.java:20) at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:265) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: java.lang.ClassNotFoundException: org.apache.maven.shared.invoker.MavenInvocationException PluginClassLoader(plugin=PluginDescriptor(name=TMC Plugin for Intellij, id=fi.helsinki.cs.tmc, descriptorPath=plugin.xml, path=~\AppData\Roaming\JetBrains\IdeaIC2021.2\plugins\tmc-plugin-intellij, version=2.0.2, package=null), packagePrefix=null, instanceId=30, state=active) at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:235) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 24 more

I can send the project to the server, but I can't run a test.