gistfile1.txt

[ERROR] Failed to execute goal org.ensime.maven.plugins:ensime-maven:1.1.1:generate (default-cli) on project tacUmbrella: Execution default-cli of goal org.ensime.maven.plugins:ensime-maven:1.1.1:generate failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.ensime.maven.plugins:ensime-maven:1.1.1:generate (default-cli) on project tacUmbrella: Execution default-cli of goal org.ensime.maven.plugins:ensime-maven:1.1.1:generate failed.
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
	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 org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal org.ensime.maven.plugins:ensime-maven:1.1.1:generate failed.
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	... 20 more
Caused by: java.lang.NullPointerException
	at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:361)
	at org.ensime.maven.plugins.ensime.EnsimeConfigGenerator.resolveAll(EnsimeConfigGenerator.java:199)
	at org.ensime.maven.plugins.ensime.EnsimeConfigGenerator.resolveEnsimeJars(EnsimeConfigGenerator.java:239)
	at org.ensime.maven.plugins.ensime.EnsimeConfigGenerator.getEnsimeServerJars(EnsimeConfigGenerator.java:340)
	at org.ensime.maven.plugins.ensime.EnsimeConfigGenerator.generate(EnsimeConfigGenerator.java:576)
	at org.ensime.maven.plugins.ensime.GenerateMojo.execute(GenerateMojo.java:94)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	... 21 more

Did you ever figure out what was the cause of this? I get the same error with one of my projects (haven't tried with any others).