trying to build in project after a version has been checked out fails

Trying to build a project for the first time works but trying to rebuild this project fails after.

2005-10-29 21:42:11,528 [SocketListener0-3] INFO Continuum - Enqueuing 'AudioKit' (Build definition id=6.
2005-10-29 21:42:12,538 [Thread-1] INFO ContinuumScm - Updating project: id: '6', name '****' with branch/tag .
2005-10-29 21:42:12,541 [Thread-1] INFO ScmManager - Executing: svn --username *** --password **** --non-interactive update -r
2005-10-29 21:42:12,542 [Thread-1] INFO ScmManager - Working directory: /Users/***/Desktop/continuum-1.0/apps/continuum/working-directory/6
2005-10-29 21:42:12,830 [Thread-1] WARN ContinuumScm - Error while updating the code for project: '***', id: '6' to '/Users/***/Desktop/continuum-1.0/apps/continuum/working-directory/6' with branch/tag .
2005-10-29 21:42:12,880 [Thread-1] WARN ContinuumScm - Command output: svn: Syntax error in revision argument ''

2005-10-29 21:42:12,882 [Thread-1] WARN ContinuumScm - Provider message: The svn command failed.
2005-10-29 21:42:13,521 [Thread-1] WARN ConfigurationService - Error reading build output for build '38'.
java.io.FileNotFoundException: /Users/****/Desktop/continuum-1.0/apps/continuum/build-output-directory/6/38.log.txt (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at org.codehaus.plexus.util.FileUtils.fileRead(FileUtils.java:269)
at org.codehaus.plexus.util.FileUtils.fileRead(FileUtils.java:261)
at org.apache.maven.continuum.configuration.DefaultConfigurationService.getBuildOutput(DefaultConfigurationService.java:167)
at org.apache.maven.continuum.notification.DefaultContinuumNotificationDispatcher.sendNotification(DefaultContinuumNotificationDispatcher.java:129)
at org.apache.maven.continuum.notification.DefaultContinuumNotificationDispatcher.buildComplete(DefaultContinuumNotificationDispatcher.java:96)
at org.apache.maven.continuum.buildcontroller.DefaultBuildController.build(DefaultBuildController.java:261)
at org.apache.maven.continuum.buildcontroller.BuildProjectTaskExecutor.executeTask(BuildProjectTaskExecutor.java:53)
at org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable.run(ThreadedTaskQueueExecutor.java:103)
at java.lang.Thread.run(Thread.java:552)