[TYPO3] FE gone after installing TIMTAB! "The page is not configured! [type= 0]"

[Edwin Blokker]

Hi,

After importing and installing tt_news and timtab, all of the FE pages 
suddenly give this error:

"The page is not configured! [type= 0][]"

I did nothing other then installing these extensions, did not configure 
them, did not change my template, or anything else. Right after 
installing the extensions, my whole FE site is gone!

What can I possibly do to get my FE pages back?! I've uninstalled the 
extensions, but nothing changes...

Hope someone can help me!

Thanks,
Edwin.

PS: I'm using typo3 4.2, and installed the latest versions of the 
extensions.