Yup, just fixed the problem by myself. Missing var line 273. No more help needed. Thank you!
Version 1.2.1, installed for the first time (3 days ago), warning appeared after deleting cat “general” and adding some new cats.
The warning as to be seen in source view:
Warning: Missing argument 1 for wp_dropdown_cats() in wp-admin/admin-functions.php on line 93
