Select and click on the task on your Open tasks or Completed tasks that is to be deleted. All the task details are displayed.
Click in the top right-hand corner. You'll be prompted to confirm the deletion of the task.
Click Delete. The task is deleted.
Error rendering macro 'panelbox' : com.atlassian.renderer.v2.macro.MacroException: Couldn't find a panelbox with the name 'purple' - please visit the plugin configuration for the panelbox plugin!