I upgraded to K2 V3.0 and restored a backup of my website before installing K2 V3.0 due to broken Created dates for K2 Items. Now I am getting PHP Fatal errors.

Website URL: jessiealma.uk

[09-Oct-2015 12:55:43 America/Denver] PHP Warning: require_once(/home5/jessieal/public_html/administrator/components/com_k2/classes/plugin.php): failed to open stream: No such file or directory in /home5/jessieal/public_html/plugins/system/k2/k2.php on line 32

[09-Oct-2015 12:55:43 America/Denver] PHP Fatal error: require_once(): Failed opening required '/home5/jessieal/public_html/administrator/components/com_k2/classes/plugin.php' (include_path='/home5/jessieal/public_html/plugins/system/shlib/shl_packages//ZendFramework-1.11.7-minimal/library:.:/usr/php/54/usr/lib64:/usr/php/54/usr/share/pear') in /home5/jessieal/public_html/plugins/system/k2/k2.php on line 32

[09-Oct-2015 14:23:29 America/Denver] PHP Fatal error: Class 'K2HelperPermissions' not found in /home5/jessieal/public_html/components/com_k2/k2.php on line 33

Can someone please help me fix this. I can give you login details if needed.

Have you tried reinstalling K2?
It seems that several required files are missing from your backup.

Reinstalling seems to have fixed the issue :) Thank you for your support

You 're welcome Simon :)