Hello!
I have launched survey on large sample (around 3000) and after some time, participants got na error:
Warning: Unknown: write wrote less bytes than requested 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

They're not able to go through the survey.
What is the problem.
It is also token based survey.

Can you help me. It is an urgent issue.

Kind regards...