[Solved] Problem with guestbook and comments

[Longwolf]

Hi,

I have upgraded from 1.7 to 1.8.1 - my provider is www.world4you.com
since the upgrade (I also upgraded all modules to the newest version), I experience problems with the guestbook & comment module

the guestbook can be read without problems, but when trying to add a new entry, there is a long list of errors displayed
  you can see that on www.killercat.net - go to guestbook - new entry
  any ideas what is wrong / to be changed here (I am not really a programmer - just try to understand whats wrong) --> I already correctet the bug described here (http://dev.cmsmadesimple.org/bug/view/5158)

the comment can be seen for example at the 2nd page (Brief an Sie) --> as you can see, there is also a lot of errors listed - but then the comment can be seen as well
  any ideas what is wrong to be changed here?

thanks for any comment
Markus