It looks like the Google Analytics for WordPress plugin is trying to open a file from the WordPress SEO Premium plugin and can't find it. Did you recently remove WP SEO Premium?
In the short term, you should be able to get back into the admin by disabling the Google Analytics plugin. You can do this via FTP by browsing to /wp-content/plugins/ and renaming the 'google-analytics-for-wordpress' folder temporarily (ie. add "disabled" to the name).