Site broken after upgrading 1.7

The site is in safe mode and this is the message on Plugins page:
Tiedoston /home3/kalliosydan/public_html/wp-content/plugins/webriti-companion/inc/spasalon/sections/spasalon-features-section.php rivill? 3 havaittiin virhe lajia E_ERROR. Virheviesti: Uncaught Error: Call to undefined function spasalon_default_data() in /home3/kalliosydan/public_html/wp-content/plugins/webriti-companion/inc/spasalon/sections/spasalon-features-section.php:3 Stack trace: #0 /home3/kalliosydan/public_html/wp-content/plugins/webriti-companion/webriti-companion.php(53): require_once() #1 /home3/kalliosydan/public_html/wp-includes/class-wp-hook.php(287): webriti_companion_activate(”) #2 /home3/kalliosydan/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #3 /home3/kalliosydan/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #4 /home3/kalliosydan/public_html/wp-settings.php(540): do_action(‘init’) #5 /home3/kalliosydan/public_html/wp-config.php(101): require_once(‘/home3/kalliosy…’) #6 /home3/kalliosydan/public_html/wp-load.php(37): require_once(‘/home3/kalliosy…’) #7 /home3/kalliosydan/public_html/wp-admin/admin.php(34): require_once(‘/home3/kalliosy…’) #8 /home3/kalliosydan/public_html/wp-admin/plugins.php(10): require_

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