None of the plugins or other features work

I’m starting to get frustrated. I can’t get this theme to work. I just wanted something that would work out of the box. First I could not install it using the usual WP upload, and now I keep getting errors all over the place. Here are two examples of errors I’m getting.

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 32 bytes) in /home2/basicimp/public_html/alchemystic.org/wp-includes/class.wp-dependencies.php on line 506

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 122880 bytes) in /home2/basicimp/public_html/alchemystic.org/wp-admin/includes/schema.php on line 969