Warning: preg_match() expects parameter 2 to be string

What do you do when this error occurs? There should be more info in your watchdog.

I had this problem - thought I had imagemagick installed but I didn't.

Try enabling the ImageAPI GD2 and disabling the ImageAPI ImageMagick module.

same error here. there's another issue dealing with this at http://drupal.org/node/269159

PS: imagemagick not installed. I also get:

warning: mkdir() expects at most 2 parameters, 3 given in /backup/tmphome/kiteatla/public_html/test/sites/all/modules/imagecache/imagecache.module on line 440.

but might be related to permissions to create folders on the server.

Images do not show up..

@marcobauli, upgrade to php5 imagecache 2.x requires it.

@portrait: gonna answer that question so someone can try to help you?

dopry, yes, i'm on PHP 5.0.4 on a site, and 5.2 on another server, and see the error in both of them actually..

in the watchdog i get

"preg_match() expects parameter 2 to be string, array given in /home/www/includes/bootstrap.inc in row 670."

and

Failed generating an image from bilder/IMG_6542_0.JPG using imagecache preset .

(another similar or probably duplicate issue is here)

thx

PS: this happens also on a fresh install of Imagecache 2 (no update)

(editing title to something easier to remember)

Marco bauli sounds likes you need to update the imagecache preset for something... an empty preset is being called...

if you're using CCK on admin/content/type/$type/display, resubmit the options where imagecache formatters are used.

Same problem with PHP Version 4.3.9 and Imagecache: 5.x-2.x-dev (same with 5.x-2.0)

log file:

imagecolortransparent(): 80 is not a valid Image resource in /var/www/httpdocs/sites/all/modules/imageapi/imageapi_gd.module on line 134.
imagecolorsforindex(): 80 is not a valid Image resource in /var/www/httpdocs/sites/all/modules/imageapi/imageapi_gd.module on line 139.
imagecopyresampled(): 80 is not a valid Image resource in /var/www/httpdocs/sites/all/modules/imageapi/imageapi_gd.module on line 63.
preg_match() expects parameter 2 to be string, object given in /var/www/httpdocs/includes/bootstrap.inc on line 670.
imagecache_scale_image failed. image: %image, data: Array ( [width] => 180 [height] => 180 [upscale] => 0 ) .
action(id:2): imagecache_scale failed for files/test/test.jpg

the preg_match part of the error was fixed over on #263058: Error in watchdog message. upgrade to 5.x-2.1 and see if this is still a problem. if so re-open this.

I had the same issue with this error. My solution was to disable the module that allows for photo uploading during registration. http://drupal.org/project/reg_with_pic Disabled - error goes away.

discovered that the error was appearing when trying to resize bitmaps.

The format type filter was not working well in previous versions, so users could still upload .bmp

@jlmeredith : THANK YOU !!!

This was killing me...