Warning: Unknown: open(/home/content/123456/123456/tmp/sess_abc123456abc123456, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0
Cause:
In my case these warnings appeared after I migrate my website in GoDaddy.
Solution:
Contact the support of your provider and ask to create the folder
/home/content/123456/123456/tmp
as from the error message (I inserted 123456 for example, in you case number will be different).
Did my solution solve your problem? Leave a comment.