Get this error:

tostring() has been removed. Please call tobytes() instead.identity=[ImageReader@0x7f49f513b550]handle_pageBegin args=()(<type 'exceptions.Exception'>, Exception('tostring() has been removed. Please call tobytes() instead.\nidentity=[ImageReader@0x7f49f513b550]\n handle_pageBegin args=()',), <traceback object at 0x7f49f51151b8>)

It's since the last update of Python and Openerp on myh synology NAS. How can i fix this? I'm not a programmer, so an easy fix would be great! :)