Allowed memory size of 67108864 bytes exhausted
Or some other byte number can be there too. In this case the memory limit is 64M, which isn’t enough, so increase the memory_limit in your php.ini to 128M, or contact your server host to do it.
You can check your hosting informations by creating a file in your server, let’s call it info.php, and put only this in it:
<?php phpinfo(); ?>
Then look at this file in your browser, and check the xdebug.max_nesting_level or the memory_limit, then you can see if your php.ini changing is working or your server host is setting the values there.