Not sure if this a filefield or commentrss issue but just to make you aware: http://drupal.org/node/288570

Disabling 'Admin >> Comment RSS publishing: Node comments for individual nodes' makes the error disappear

Drupal 6.3, PHP 5.2.5, MySQL 4.1.22-standard

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gábor hojtsy’s picture

gábor hojtsy
he/him
Primary language Hungarian
Location Hungary
commented
Status: Active » Closed (duplicate)

From the mentioned issue, looks like this is an issue in filefield.