Node: Posted Date and View Argument

Not sure where this issue resides but I figured I would post here first and if it is a views issue I will post there next.

PHP 5.2.6

Creating View --> Add Argument --> Groups Date:Date -->
Summary, sorted ascending --> Granularity: Day --> Date Fields: Node: Post date --> List --> Link with count --> all rest default settings

Results:
warning: date_format() expects parameter 1 to be DateTime, boolean given in C:\xampp\htdocs\drupal\sites\all\modules\date\date_api.module on line 1031.

All i am trying to do is to get a list of nodes by post date IE when using date...

Wednesday, February 11, 2009 (1)
Thursday, February 12, 2009 (4)
Friday, February 13, 2009 (2)
etc...