theme access

Ive been having problems with uploading themes onto my host. I was unable to see any of the themes on preview.

kept on getting a page saying unable to complete request (or something)

So I went to the Word Press website and downloaded zip files of the themes I wanted and then I uploaded them to my host. now I can open them to preview or edit them. I can activate them and I can see them in my list of themes but I cant access them at all. I just get the message above and I dont know how to fix it.
I am new to word press and to hosting and to web site development.

then I received this

Warning: require(/srv/disk8/1068039/www/abriculture.com/wp-content/themes/yoko/inc/theme-options.php) [function.require]: failed to open stream: No such file or directory in /srv/disk8/1068039/www/abriculture.com/wp-content/themes/twentyeleven/functions.php on line 86

Fatal error: require() [function.require]: Failed opening required ‘/srv/disk8/1068039/www/abriculture.com/wp-content/themes/yoko/inc/theme-options.php’ (include_path=’.:/usr/local/php5/share/pear’) in /srv/disk8/1068039/www/abriculture.com/wp-content/themes/twentyeleven/functions.php on line 86

What does this mean