[Typo3] mysql fetch error / tt_news and mbl_event

[Christine Molina]

Hello,

The last few days I was updating tt_news and mbl_event and I thought 
everything went all right, only today I get the following error when I try 
to see the news page. I don't know why? Can someone give me some ideas?

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result 
resource in /home/internet/public_html/cms/t3lib/class.t3lib_db.php on line 
723

Warning: Cannot modify header information - headers already sent by (output 
started at /home/internet/public_html/cms/t3lib/class.t3lib_db.php:723) in 
/home/internet/public_html/cms/tslib/class.tslib_fe.php on line 2402

Thanks in advance,