Problems with Style Manager

[habbworpe]

Hi there, when I try to Save something in the Style Manager, using the default style, it shows up:

Fatal error: Invalid styleid specified in /includes/adminfunctions_template.php on line 318

see, i've looked up line 318 and it says:
trigger_error('Invalid styleid specified', E_USER_ERROR);

i also tried reuploading the adminfunctions_template.php and nothing happened.

ty