Dear Mamduh,
Thank you for using the UCSC Genome Browser and your question about track hubs.
Are you still seeing the error, perhaps you are visiting a mirror of the UCSC Genome Browser and not our official site,
http://genome.ucsc.edu/?
Thank you again for your inquiry and using the UCSC Genome Browser. If you have any further questions, please reply to
gen...@soe.ucsc.edu. All messages sent to that address are archived on a publicly-accessible forum. If your question includes sensitive data, you may send it instead to
genom...@soe.ucsc.edu.
All the best,
Brian Lee
UCSC Genome Bioinformatics Group