I am a beginner having trouble with wordpress. I uploaded a premium theme on my website and then selected it on the admin panel. I had to re-upload the theme and now my blog page is blank and I cannot access the admin panel! There is no wordpress theme visible (premium or default). Please help! Am I doing something wrong with uploading the theme? My 'style.css' file is blank (size 0). How do I fix this? I tried deleting the entire theme and uploading it again, to no avail.