Error In Avatar Plugin

I'd installed the AVATAR plugin, when I uploaded my avatar I got this error:

Warning: getimagesize() [function.getimagesize]: URL file-access is disabled in
the server configuration in
/home/.grub/u07cccc/cccc.gov.ec/wp-content/mu-plugins/avatar.php on line 244

Warning:
getimagesize(http://cccc.gov.ec/articulos_revisar/avatar/cristina_0e66.jpg)
[function.getimagesize]: failed to open stream: no suitable wrapper could be
found in /home/.grub/u07cccc/cccc.gov.ec/wp-content/mu-plugins/avatar.php on
line 244

Please help me.

I supose is a server problem that restring the access to the file, I'm using
DreamHost