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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.ProjectModelResolver.resolveModel(ProjectModelResolver.java:155)	at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:813)	at org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:664)	at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:310)	at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:232)	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:142)	at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:309)	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.recurse(DefaultLegacyArtifactCollector.java:584)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)	at org.apache.maven.repository.legacy.resolver.DefaultLegacyArtifactCollector.recurse(DefaultLegacyArtifactCollector.java:584)	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:944)	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 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$255(TCPTransport.java:683)