page types giving me an error when applying stack

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I have a stack I am trying to apply to my page type and I am getting an error:

Fatal error: Call to a member function getBlockCollectionObject() on a non-object in /mysite/html/pizzalogs2/concrete/models/permissions.php on line 373

please let me know what is happening and why

 
Job replied on at Permalink Reply
Job
Are you using any custom blocks or packages?