Good afternoon!

I upgraded to version 4 and not replace the file db.php, and now appeared a lot of error that I can not solve and the news does not appear correctly.
Following is the error:

Warning: unserialize() expects parameter 1 to be string, array given in D:\hshome\redetvcnp\redetvcnp.com.br\news\functions.php on line 741

Site: http://www.redetvcnp.com.br