del icio us integrator problem…

Installed this plugin and have a problem!! Anyone help!

https://ericanderson.us/projects/delicious-integrator/

But getting this error when using it…
Warning: Call-time pass-by-reference has been deprecated – argument passed by value; If you would like to pass it by reference, modify the declaration of xml_set_object(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. In ….plugins/delicious-integrator/delicious.php on line 108