After creating an issue, I get an error

Hi,

warning: preg_match() expects parameter 2 to be string, array given in /var/www/shared/drupal6.10/includes/bootstrap.inc on line 771.
warning: preg_match() expects parameter 2 to be string, array given in /var/www/shared/drupal6.10/includes/bootstrap.inc on line 771.
warning: preg_match() expects parameter 2 to be string, array given in /var/www/shared/drupal6.10/includes/bootstrap.inc on line 771.

This is what I get, after creating an issue.
The values from the dropdown boxes get somehow not transferred into the database:

Project:
Component:
Kategorie:
Priority:
Assigned: Unassigned
Status:

But I've choosen everything within this issue.

I use: Project 6.x-1.x-dev
Project issue tracking 6.x-1.x-dev

Does anybody know a solution?
Thank you in advance!
Bye, Transmitter