Warning: Unknown: open(/tmp/sess_qgoeooobch4di3h265gc5lhdt0, O_RDWR – See more a

Hello.
At the end of the page the message.

Warning: Unknown: open(/tmp/sess_qgoeooobch4di3h265gc5lhdt0, O_RDWR) failed: Permission denied (13) 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 (/tmp) in Unknown on line 0 – See more at: http://ajudajunto.com/#sthash.I08vChET.dpuf

And the Submit button to a project does not link to /launch_project, link to http: //…./wp-admin/post-new.php post_type = project

thanks