[support] After copying site I get Calendar module warnings...

[Jarry]

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

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