Banner Manager error

[Guest]

Hi, folks!

 

At the beginnig, my Banner Manager runs perfectly. Suddently I get these errors:

 

Warning: imagegif(): Unable to access images/graphs/banner_infobox-26.gif in /docroot/admin/includes/classes/phplot.php on line 502

 

Warning: imagegif(): Invalid filename 'images/graphs/banner_infobox-26.gif' in /docroot/admin/includes/classes/phplot.php on line 502

 

Thanks for your spend your time to teach me.

 

Thanks.,

Felix