Thanks I will contact to my hosting.
For witch function Can I ask? :l
Go to ACP > Tools & Maintenance > View PHP Info > do a page search for 'gd', is the a table with a heading of 'gd'?? If there's not, gd isn't installed, which is what I'd say the problem is.
The CAPTCHA doesn't actually use imagecreatefrompng() but I guess it checks for this function as if this one is available, the others will be too.
Thanks, isn't installed I will ask
I'd make some or get some and add them