Blank screen after upgrade

I followed the tutorial exactly and tried to upgrade from 1.3.8a to 1.3.9b.

Unfortunately, I cannot access my site front and backend, only a blank screen is shown. Even though I switched back to the standard template, the blank screen continued to show up.

After 1 day of trying and many restores, I am unable to upgrade my site and decided to continue with version 1.3.8a

What could be reason of this?

Thanks!

Jc,
root/ cache

1. please post back the last error log

I cleaned my server already

I try again tonight. If it fails again, I will drop the log, thnx for ur quick reply.

cheers

Sorry for my late update,

I found out that the problem was within my template file. It was looking for the supertracker class file from the supertracker jscript file in my template folder, which was not there.

The debug log helped me out.