Causas da persistente falta de rim recurso

Warning: Unknown: open(/tmp/sess_16jgnlq96n1pjvhfaivbuvo5v2, 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