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Notice: Undefined variable: composeParams in CRM_Mailing_Form_Upload->postProcess() (line 400 of /var/aegir/platforms/civicrm-v4.2-d7/sites/all/modules/civicrm/CRM/Mailing/Form/Upload.php).
We call CRM_Utils_Array() on a variable, but don't (always) set it first.
Visible on step 4 of 5 in current SVN. Dependent on PHP error output settings of course.