[TYPO3-english] EXT:image_autoresize error on v6

[Mario]

Hi to all,

I get this error when upload to fileadmin (or any subfolder):

Core: Error handler (BE): PHP Warning: is_file() expects parameter 1 to 
be string, array given in 
/home/***/public_html/v6/typo3conf/ext/image_autoresize/classes/class.user_fileupload_hooks.php 
line 257

Tried with single and multiple images, same error, if someone know what 
is the problem (Typo3 6.0.2, PHP 5.3.21).

__
regards
Mario