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java.lang.NullPointerException: 	at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolve(DefaultMetadataResolver.java:279)	at org.sonatype.aether.impl.internal.DefaultMetadataResolver.resolveMetadata(DefaultMetadataResolver.java:173)	at org.apache.maven.repository.internal.DefaultVersionResolver.resolveVersion(DefaultVersionResolver.java:225)	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:272)	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:216)	at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:193)	at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:286)	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:285)	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:267)	at org.apache.maven.project.artifact.MavenMetadataSource.retrieveRelocatedProject(MavenMetadataSource.java:579)	at org.apache.maven.project.artifact.MavenMetadataSource.retrieve(MavenMetadataSource.java:192)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:532)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.collect(DefaultLegacyArtifactCollector.java:144)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolve(CustomMaven3ArtifactResolver.java:458)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveWithExceptions(CustomMaven3ArtifactResolver.java:313)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveTransitively(CustomMaven3ArtifactResolver.java:307)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveTransitively(CustomMaven3ArtifactResolver.java:286)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveTransitively(CustomMaven3ArtifactResolver.java:264)	at org.jetbrains.idea.maven.server.embedder.CustomMaven3ArtifactResolver.resolveTransitively(CustomMaven3ArtifactResolver.java:257)	at org.jetbrains.idea.maven.server.Maven30ServerEmbedderImpl.resolveTransitively(Maven30ServerEmbedderImpl.java:963)	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:323)	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$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)	at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)	at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)	at com.sun.proxy.$Proxy195.resolveTransitively(Unknown Source)	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 com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:124)	at com.intellij.execution.rmi.RemoteUtil.access$100(RemoteUtil.java:36)	at com.intellij.execution.rmi.RemoteUtil$2$1$1.compute(RemoteUtil.java:105)	at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:181)	at com.intellij.execution.rmi.RemoteUtil$2$1.invoke(RemoteUtil.java:102)	at com.sun.proxy.$Proxy195.resolveTransitively(Unknown Source)	at org.jetbrains.idea.maven.server.MavenEmbedderWrapper$8.execute(MavenEmbedderWrapper.java:168)	at org.jetbrains.idea.maven.server.MavenEmbedderWrapper$8.execute(MavenEmbedderWrapper.java:165)	at org.jetbrains.idea.maven.server.RemoteObjectWrapper.perform(RemoteObjectWrapper.java:89)	at org.jetbrains.idea.maven.server.MavenEmbedderWrapper.resolveTransitively(MavenEmbedderWrapper.java:165)	at org.jetbrains.idea.maven.utils.library.RepositoryAttachHandler.doResolveInner(RepositoryAttachHandler.java:342)	at org.jetbrains.idea.maven.utils.library.RepositoryAttachHandler.resolveAndDownloadImpl(RepositoryAttachHandler.java:144)	at org.jetbrains.idea.maven.utils.library.remote.MavenDependenciesRemoteManager.execute(MavenDependenciesRemoteManager.java:79)	at org.jetbrains.idea.maven.utils.library.remote.MavenDependenciesRemoteManager.execute(MavenDependenciesRemoteManager.java:31)	at org.jetbrains.idea.maven.utils.library.remote.MavenRemoteManager$4.run(MavenRemoteManager.java:134)	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)	at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:142)	at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:446)	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:392)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:127)	at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:126)	at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:369)	at java.util.concurrent.Executors$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)