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
In my case these warnings appeared after I migrate my website in GoDaddy.
Contact the support of your provider and ask to create the folder
as from the error message (I inserted 123456 for example, in you case number will be different).
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