BackWPUp and DropBox curl_setopt() warning

Hi! Thank you so much for creating this plugin, it’s definitely my favorite plugin for WordPress.

After the recent update, I am now receiving the following error. I assume some line in the code used the curl_setopt() wrong.

I looked through the code and found the problem in dest_dropbox.php. Commenting out line 40, $oauth->ProgressFunction='curl_progresscallback';, solves the problem since a ProgressFunction is specified but not defined anywhere.

2011/08/07 11:37.52: 1.85 GB free on DropBox
2011/08/07 11:37.52: Upload to DropBox now started...
2011/08/07 11:37.52: Undefined variable: curl
2011/08/07 11:37.52: [WARNING] curl_setopt() expects parameter 1 to be resource, null given
2011/08/07 11:37.52: Undefined variable: curl
2011/08/07 11:37.52: [WARNING] curl_setopt() expects parameter 1 to be resource, null given
2011/08/07 11:37.52: Undefined variable: curl
2011/08/07 11:37.52: [WARNING] curl_setopt() expects parameter 1 to be resource, null given