try setting error reporting to "simple" or "none" in joomla global configuration

That does not fix the conflict/error it just hides it and because of this conflict/error i can't add a "Browser Page Title", since its replaced with . Furthermore my meta tags such as description etc. are not generated in source code!!!

yes it was just so you could got ride of the warnings. these are just warnings, not "errors", so they don't affect functionality. I'm looking into it.
please send me access to your page if you want so I can take a look.

in which page are you having this? the title should be populated, maybe that's an issue of only this particular page. which one is it?

Whats your e-mail, so i can send login info?

PS: Please answer: http://www.joomlathat.com/support/music-collection/tags-type-and-press-enter-not-working

the email is support@ joomlathat.com please be sure to indicate to me which page the error appears on.

thanks!