GD2 create thumbnail error

[Moozie]

I ise the GD2 image converter.
It worked fine until now When uploading an image it doesn't create a thumb automatically. Clicking create thumb returns an error:

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Error while writing file to storage (1).

When I click an existing thumb (most made by Imagick) and click create thumbnail again i get:

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Warning: getimagesize(/home/httpd/vhosts/mydomain.nl/httpdocs/phpwcms/phpwcms_filestorage/1/1_14.jpg): failed to open stream: Permission denied in /home/httpd/vhosts/mydomain.nl/httpdocs/phpwcms/include/inc_act/act_imagick.php on line 86

file format problem: check the given image (CMYK JPEG?) 
 

Any clue on this?

[oops]

If you have installed ImageMagick it is recommend to use it because of ImageMagick's support of many different image formats. But GD2 should be available on any current PHP installation [check your phpinfo();]. GD2 creates much better images than GD1 - it is quite fast. It is not possible to handle CMYK JPG files with GD. Only GIF, JPG/JPEG, PNG are supported in GD -> phpwcms will safe JPG only.