Studio/ Player Error

OK, a few things:

mysql> select * from ui_conf where id=$PLAYER_ID\G

Then, does /opt/kaltura/web/VALUE_RETURNED_FROM_conf_file_path_COLUMN exist?
If not, is the directory writeable to the Apache user? if it does exist, is it readable to the Apache user and does it have content?

Also, is the value for the html5_url column correct?