Hi,

My site is at www.marcrjacobs.com and uses the "elegant" theme.

I'm getting the following error message when I click on any image to zoom. For example; http://www.marcrjacobs.com/picture.php?/1980/category/4

The error is as follows, between the bars:
==========================
Notice: Undefined index: day in /home/marcrjacobs/public_html/include/functions.inc.php on line 665

Notice: Undefined index: month in /home/marcrjacobs/public_html/include/functions.inc.php on line 671

Notice: Undefined index: day in /home/marcrjacobs/public_html/include/functions.inc.php on line 665

Notice: Undefined index: month in /home/marcrjacobs/public_html/include/functions.inc.php on line 671

Notice: Undefined variable: thisSize in /home/marcrjacobs/public_html/plugins/Preload/main.inc.php on line 197

Fatal error: Uncaught TypeError: Argument 2 passed to DerivativeImage::__construct() must be an instance of SrcImage, string given, called in /home/marcrjacobs/public_html/plugins/Preload/main.inc.php on line 197 and defined in /home/marcrjacobs/public_html/include/derivative.inc.php:193 Stack trace: #0 /home/marcrjacobs/public_html/plugins/Preload/main.inc.php(197): DerivativeImage->__construct(NULL, 'medium') #1 /home/marcrjacobs/public_html/include/functions_plugins.inc.php(279): Preload_populate_images() #2 /home/marcrjacobs/public_html/include/page_header.php(29): trigger_notify('loc_begin_page_...') #3 /home/marcrjacobs/public_html/picture.php(1042): include('/home/marcrjaco...') #4 {main} thrown in /home/marcrjacobs/public_html/include/derivative.inc.php on line 193
==========================

Can anyone please give me some advice on how to proceed?

Piwigo 2.9.2
Operating system: Linux
PHP: 7.1.8 (Show info) [2017-11-19 17:32:21]
MySQL: 5.6.36-cll-lve [2017-11-19 10:32:21]
Graphics Library: External ImageMagick 6.7.2-7
Piwigo URL: http://www.marcrjacobs.com