ilog Rules Preventing OpenDeploy Deployments

Problem
OpenDeploy deployments are failing with the following type of errors:
Error during task execution: Production Deployment, message:
java.lang.NullPointerException *** START STACK TRACE ***
com.interwoven.livesite.rules.ilog.RuleSession.
<init>(RuleSession.java:77)
com.interwoven.livesite.rules.ilog.RuleSession.getContentSession
(RuleSession.java:285)
com.interwoven.livesite.rules.ilog.RuleAppUtils.getContentRuleAppArchives
(RuleAppUtils.java:221)
com.interwoven.livesite.rules.ilog.RuleAppUtils.getContentRuleApps
(RuleAppUtils.java:196)
com.interwoven.livesite.opendeploy.impl.OpenDeploymentServiceAdapter.
buildDeployment
(OpenDeploymentServiceAdapter.java:154)
com.interwoven.livesite.opendeploy.impl.OpenDeploymentServiceAdapter.
buildDeployments
(OpenDeploymentServiceAdapter.java:222)
com.interwoven.livesite.opendeploy.impl.OpenDeploymentServiceAdapter.
buildDeployments
(OpenDeploymentServiceAdapter.java:55)
com.interwoven.livesite.deployment.impl.BaseDeploymentService.
buildDeploymentList
(BaseDeploymentService.java:213)
com.interwoven.livesite.deployment.impl.BaseDeploymentService.deployFiles
(BaseDeploymentService.java:85)
com.interwoven.livesite.workflow.task.DeploymentTask.deployFiles
(DeploymentTask.java:82) *** END STACK TRACE *** [user: 12/15/08 1:56:11 PM ]
Potential Solution
Re-start the TeamSite Services including the rules service, it might be hung due to a port conflict or other issue.