Jarry, there are some patches for this on Calendar Project issues. http://drupal.org/node/613528

Good luck.

Message: 1 Date: Wed, 18 Aug 2010 21:34:55 +0200 From: Jarry mr.jarry@gmail.com Subject: [support] After copying site I get Calendar module warnings... To: support support@drupal.org Message-ID: 4C6C35DF.5060201@gmail.com Content-Type: text/plain; charset=UTF-8; format=flowed

Hi,

I wanted to have a local development version of my drupal site running on my home-computer, so I installed wamp and made a copy of database and files. But when I look with web-browser at the local version, I get a lot of warnings on every page:

------------------ warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_page.inc on line 47. warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_page.inc on line 48. warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_page.inc on line 49. ... warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_attachment.inc on line 165. warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_attachment.inc on line 166. warning: Attempt to modify property of non-object in C:\wamp\www\sites\all\modules\calendar\includes\calendar_plugin_display_attachment.inc on line 167. ------------------

These warnings drive me mad, because they fill 2-3 screens and screw the layout of the whole web site. What could be the reason for it, and how can I fix it?

Jarry