drupal 7 overlay is not rendering in my site

Question

I am using drupal 7 for my site.

All of a sudden /admin/content?render=overlay showing no data received. :-(

And in console itshowing that defaultVIew is not defined in overlay-parent.js

Answer 1

This problem is occurred because in php.ini max_execution_time is set to low and memory_limit value also set to low.