Registration with facebook error

I'm trying to get registered with Facebook Account but it gives following error.

Error : Warning: file_put_contents(d:disappointed:model_create.txt) [function.file-put-contents]: failed to open stream: No such file or directory in /home/shivajik/public_html/ecoface.in/ef/wp-content/plugins/wpmu-dev-facebook/lib/class_wdfb_model.php on line 221