Below error message was shown after I click "Next" in the welcome page:
"We are sorry but your session has expired. Please refer to the email you received and re-enter this survey.
Either you have been inactive for too long, you have cookies disabled for your browser, or there were problems with your connection."

There are totally 6 questions in my survey, where 3 of them are Array(Numbers) questions, 1 List(Radio) question and 2 Multiple Choice questions.
For the first Array(Numbers) question, there are 28 attributes in Y-Scale while there are 10 attributes in X-Scale.
For the second Array(Numbers) question, there are 18 attributes in Y-Scale while there are 10 attributes in X-Scale.
For the third Array(Numbers) question, there are also 18 attributes in Y-Scale while there are 10 attributes in X-Scale.

However, if I remove the third Array(Numbers) question and keep only 2 Array(Numbers) questions in the survey, this error message will not be shown and I can finish the survey.

May I ask if there is any limitation when using Array(Numbers) question? Thanks!

Surely a max_input_vars issue : manual.limesurvey.org/Troubleshooting#Af...d_not_be_verified.27

Thanks for your quick revert.

May i ask if the no. of variables means the no. of columns in the export csv /excel ?

If yes, the no. of columns of my survey is less than 1,000 indeed. And I checked PHP which max_input_vars is set to be 1,000. Not sure why such error message is displayed......

Hi,

If i put a link to manual : please rtead it.
I spoke for server
28×10+18×10+18×10 = 640 + some needed hidden input (sid/crsf/token ...) + some hidden input for js : surely more than 1000 input.

Hi,

However, the no. of columns in the export csv/excel is only 698, which is less than 1000. Why such error message is displayed??

You may refer to the attachment to see which figure I am referring to.

Please advise. Thanks!

some needed hidden input (sid/crsf/token ...) + some hidden input for js

For testing purpose : set manual.limesurvey.org/Debug_mode