[...]
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 4.163s
Finished at: Wed Mar 16 14:41:44 NZDT 2011
Final Memory: 11M/100M
------------------------------------------------------------------------
Failed to execute goal org.apache.maven.plugins:maven-car-plugin:1.0-SNAPSHOT:car (default-car) on project mavenproject85-appclient: Error assembling CAR: /home/dev/projs/mavenproject85-AppClientTesting/mavenproject85-appclient/target/mavenproject85-appclient-1.0-SNAPSHOT isn't a directory. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-car-plugin:1.0-SNAPSHOT:car (default-car) on project mavenproject85-appclient: Error assembling CAR
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
	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:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error assembling CAR
	at org.apache.maven.plugin.car.CarMojo.execute(CarMojo.java:262)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: org.codehaus.plexus.archiver.ArchiverException: /home/dev/projs/mavenproject85-AppClientTesting/mavenproject85-appclient/target/mavenproject85-appclient-1.0-SNAPSHOT isn't a directory.
	at org.codehaus.plexus.archiver.AbstractArchiver.addFileSet(AbstractArchiver.java:258)
	at org.codehaus.plexus.archiver.AbstractArchiver.addDirectory(AbstractArchiver.java:244)
	at org.codehaus.plexus.archiver.AbstractArchiver.addDirectory(AbstractArchiver.java:226)
	at org.codehaus.plexus.archiver.AbstractArchiver.addDirectory(AbstractArchiver.java:220)
	at org.apache.maven.plugin.car.CarMojo.execute(CarMojo.java:255)
	... 21 more


For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException