I have run into the same problem on my WL-500gP (on HeadStart II tutorial for oleg 1.9.2.7-10). I'm quite a newbie but I did the following without luck:
* I created a "mediatomb" db in mysql (according docs this is required and there was none after running S90mediatomb.)
* I added the "mysql" tags to config.xml.
I was able to create this db but I wonder if I managed to give mediatomb access priviliges to this db? Does anyone know how to setup this?
I probably need to configure both mysql and mediatomb for this to work properly (it takes two to tango...) But I'm unsure about howto...