I have updated Moodle from 2.7.2 to 3.1
Also updated questionnaire to mod_questionnaire_moodle32_2016111102.zip
There was Internal server error when I tried to access a survey from a course so I changed all permissions to 755 and 644 for folders and files respectively.
Now I can see the activity, but when I go to view all responses they have disappeared.
Can anyone please help me?