Hi,
I have reviewed your project description and I feel I am the right candidate for this job. I have several years experience working with Wordpress, Linux, Apache, MySQL, and PHP. I have done transfers of wordpress sites from one site to another before. This required me to export the database using the export feature in wordpress, and then importing it into the new site. I also had to install wordpress, transfer over the theme, etc... and then make sure everything works. I did this for a company called Boomdizzle (it's a hop hop social music website).
I also have experience using other methods to export databases. This would require access to the mysql server itself. I can do this from the command line (which would require me to have shell access so I can ssh in), or I can use some other methods. So if we are unable to export the database from wordpress itself, then all is not lost. I can still use these other methods to export the database. I may also be able to help you figure out why it's giving you an internal error, and solve that for you so that you can export the database through wordpress. I would need to have access to the server logs though so I can review them.
Anyway, let me know if you have any questions or if there's any other information you want me to provide. I also have a resume attached to my profile. You can check that out if you want. Thank you for taking the time to consider my bid and I look forward to working with you.