XF 1.5 Fatal error: Class 'Zend_Validate_EmailAddress'

[Drew]

After updating Xenforo users are unable to create new accounts. When attempting to make a new account this error comes up:

Fatal error: Class 'Zend_Validate_EmailAddress' not found in /home/content/33/8436533/html/library/XenForo/Helper/Email.php on line 68

File check is perfect. Permissions look correct. Any ideas?

 

[Drew]

Uploaded a fresh Zend directory and that seems to have fixed the issue.