maven import dependency error

Problem

maven plugin throws an exception while importing project's dependency.  It looks like some jar version conflicts, and I want to know how to fix this kind of problems: the IntelliJ idea plugins jar version conflicts. 

Downloading the right version jar to the   /⁨Applications⁩/⁨IntelliJ IDEA.app⁩ /⁨Contents⁩/⁨plugins⁩/{pluginName}/lib/  ??? 

mac pro && IntelliJ idea 2018.3  && maven plugin 2.2.1

2019-04-22 21:16:10,960 [370080920]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.alibaba.schedulerx:schedulerx-api:0.0.1-SNAPSHOT: checking for updates from central 
2019-04-22 21:16:11,006 [370080966]   INFO -      #org.jetbrains.idea.maven - [WARNING] *** CHECKSUM FAILED - Checksum failed on download: local = '14dfeff4ae068e66905c3a342aed3658720ee851'; remote = 'd1ecc25f7315dbd246ddbbe32cf4788c55af6c87' - RETRYING 
2019-04-22 21:16:11,045 [370081005]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.alibaba.schedulerx:schedulerx-api:0.0.1-SNAPSHOT: checking for updates from snapshots 
2019-04-22 21:16:11,105 [370081065]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.taobao.liuliangbao:liuliangbao-client:1.3.2-SNAPSHOT: checking for updates from central 
2019-04-22 21:16:11,150 [370081110]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.taobao.liuliangbao:liuliangbao-client:1.3.2-SNAPSHOT: checking for updates from snapshots 
2019-04-22 21:16:11,195 [370081155]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.taobao.tmallequity:tmallequity-parent:1.0.0-SNAPSHOT: checking for updates from central 
2019-04-22 21:16:11,239 [370081199]   INFO -      #org.jetbrains.idea.maven - [INFO] snapshot com.taobao.tmallequity:tmallequity-parent:1.0.0-SNAPSHOT: checking for updates from snapshots 
2019-04-22 21:16:11,550 [370081510]   INFO -      #org.jetbrains.idea.maven - java.rmi.ServerError: Error occurred in server thread; nested exception is: 
	java.lang.NoClassDefFoundError: org/codehaus/plexus/util/StringUtils 
java.lang.RuntimeException: java.rmi.ServerError: Error occurred in server thread; nested exception is: 
	java.lang.NoClassDefFoundError: org/codehaus/plexus/util/StringUtils
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl$2.fun(Maven2ServerEmbedderImpl.java:302)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl$2.fun(Maven2ServerEmbedderImpl.java:282)
	at com.intellij.util.containers.ContainerUtilRt.mapNotNull(ContainerUtilRt.java:395)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl.resolveProject(Maven2ServerEmbedderImpl.java:282)
	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:498)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)
	at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
	at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
	at com.sun.proxy.$Proxy227.resolveProject(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor3925.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:179)
	at com.intellij.execution.rmi.RemoteUtil.access$300(RemoteUtil.java:39)
	at com.intellij.execution.rmi.RemoteUtil$2$1$1.compute(RemoteUtil.java:160)
	at com.intellij.openapi.util.ClassLoaderUtil.runWithClassLoader(ClassLoaderUtil.java:66)
	at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:231)
	at com.intellij.execution.rmi.RemoteUtil$2$1.invoke(RemoteUtil.java:157)
	at com.sun.proxy.$Proxy227.resolveProject(Unknown Source)
	at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.lambda$resolveProject$5(MavenEmbedderWrapper.java:118)
	at org.jetbrains.idea.maven.server.RemoteObjectWrapper.performCancelable(RemoteObjectWrapper.java:89)
	at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.resolveProject(MavenEmbedderWrapper.java:116)
	at org.jetbrains.idea.maven.project.MavenProjectReader.resolveProject(MavenProjectReader.java:494)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.doResolve(MavenProjectsTree.java:1293)
	at org.jetbrains.idea.maven.project.MavenProjectsTree.resolve(MavenProjectsTree.java:1265)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessorResolvingTask.perform(MavenProjectsProcessorResolvingTask.java:45)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor.doProcessPendingTasks(MavenProjectsProcessor.java:134)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor.access$000(MavenProjectsProcessor.java:32)
	at org.jetbrains.idea.maven.project.MavenProjectsProcessor$2.run(MavenProjectsProcessor.java:109)
	at org.jetbrains.idea.maven.utils.MavenUtil.lambda$runInBackground$5(MavenUtil.java:451)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.rmi.ServerError: Error occurred in server thread; nested exception is: 
	java.lang.NoClassDefFoundError: org/codehaus/plexus/util/StringUtils
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:374)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:283)
	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:260)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
	at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
	at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
	at com.sun.proxy.$Proxy3.artifactDownloaded(Unknown Source)
	at org.jetbrains.idea.maven.server.embedder.TransferListenerAdapter.transferCompleted(TransferListenerAdapter.java:78)
	at org.apache.maven.wagon.events.TransferEventSupport.fireTransferCompleted(TransferEventSupport.java:141)
	at org.apache.maven.wagon.AbstractWagon.fireGetCompleted(AbstractWagon.java:519)
	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:319)
	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:276)
	at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:97)
	at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
	at org.apache.maven.artifact.manager.DefaultWagonManager.getRemoteFile(DefaultWagonManager.java:546)
	at org.apache.maven.artifact.manager.DefaultWagonManager.getArtifact(DefaultWagonManager.java:427)
	at org.jetbrains.idea.maven.server.embedder.CustomWagonManager.getArtifact(CustomWagonManager.java:79)
	at org.apache.maven.artifact.manager.DefaultWagonManager.getArtifact(DefaultWagonManager.java:382)
	at org.jetbrains.idea.maven.server.embedder.CustomWagonManager.getArtifact(CustomWagonManager.java:62)
	at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:216)
	at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:90)
	at org.jetbrains.idea.maven.server.embedder.CustomArtifactResolver.resolve(CustomArtifactResolver.java:51)
	at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository(DefaultMavenProjectBuilder.java:558)
	at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:251)
	at org.apache.maven.project.artifact.MavenMetadataSource.retrieveRelocatedProject(MavenMetadataSource.java:163)
	at org.apache.maven.project.artifact.MavenMetadataSource.retrieveRelocatedArtifact(MavenMetadataSource.java:94)
	at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:387)
	at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:435)
	at org.apache.maven.artifact.resolver.DefaultArtifactCollector.collect(DefaultArtifactCollector.java:74)
	at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:316)
	at org.jetbrains.maven.embedder.MavenEmbedder.resolveProject(MavenEmbedder.java:217)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl$2$1.execute(Maven2ServerEmbedderImpl.java:290)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl$2$1.execute(Maven2ServerEmbedderImpl.java:286)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerEmbedderImpl$6.run(Maven2ServerEmbedderImpl.java:577)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: org/codehaus/plexus/util/StringUtils
	at org.sonatype.nexus.index.DefaultArtifactContextProducer.getArtifactContext(DefaultArtifactContextProducer.java:96)
	at org.jetbrains.idea.maven.server.embedder.Maven2ServerIndexerImpl.addArtifact(Maven2ServerIndexerImpl.java:255)
	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:498)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
	... 3 more
Caused by: java.lang.ClassNotFoundException: org.codehaus.plexus.util.StringUtils
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 19 more