Guestbook not sending comments

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Hello there,

I just set up the C5 simple blog. The guestbook gives errors even though all entries are correct. It shows these:
Please correct the following errors:
- Name is required
- Invalid Email Address
sometimes even for the captcha after it is accepted (by the captcha add-on):

-incorrect captcha

could you please help me solve this?

thank you very much,

regards,