[TYPO3] sr_feuser_register and error in upload image

[Roberto Torresani]

Hi all!

on a my site when i try to upload a image in the user profile of the module
sr_feuser_register I have a error.

In the apache log file I have the message:

PHP Fatal error:  Call to a member function on a non-object in
/var/www/vhosts/st.clickyou.it/httpdocs/typo3conf/ext/sr_feuser_register/model/class.tx_srfeuserregister_data.php
on line 641,

The line of the code is:
$theDestFile =
$this->fileFunc->getUniqueName($this->fileFunc->cleanFileName($tmpFilename),
PATH_site.$uploadPath.'/');

What cuold be the problem?

Thanks
Roberto