I created a simple Plan without any repositories and created a job and task. Task is a simple shell script. However, Bamboo (version 6.3.2) is not able to execute the task and fails with a message "# <build number> did not start" and in the error log section the message is "Build was not queued due to error"
Bamboo Error Viewer - Atlassian Bamboo
com.atlassian.bamboo.v2.build.queue.BuildPreQueuedActionFailureException: java.lang.NullPointerException
at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.fireCustomPreBuildQueuedActions(BuildQueueManagerImpl