This is an issue with Version 9. You need to make sure you clear the tasks before you delete the QVW.. Here is how to fix it. Please backup any files you edit before you do.
Stop the QlikView Publisher Command Center Service
Edit the DocumentTask.xml remove the lines that are invalid.
Start the QlikView Publisher Command Center Service
Now in the QlikView Management Console edit one of the tasks that is still valid. I have been able to just open the task and save it.
Now the old ones shouldn't be under Status anymore.