Joomla Picture Profile Extension

good morning,
please help me i need the user can registry in my site and upload a picture profile

i'm already downloaded and installed the extension profile picture: you can see the link

http://extensions.joomla.org/extensi...nagement/19702

but on my test site when i try to register some accaunt and upload a picture i receive a message no valid picture was upload

(i try with jpg less than 200pixel)... i set 777 folder permission...

somebody can help me?

this is my test site:
http://costaitofficer.altervista.org.../registrazione

[Gianluca]

Can you please past the exact error message you are displaying?