Joomla 1.5 to 1.7

Dear sir, madam,

Recently, I created a new website with joomla 1.7
On my old website (joomla 1.5), there was also an easybook realoaded guestbook.
When coppied the joomla 1.5 database of easybook to the 1.7 version, there seemed to be no problem, as I could see all the recent entries.
But, when I try to sign the guestbook on my new site, easybook realoaded gives an error: 'Please validate your inputs! Error: '
In the attachment, you can see what I see when I try to sign it.

Thanks in advance for the help!

With kind regards,

Floris237

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