Hello,
I use Goldencan Version 2 PHP scripts so that I have online affiliate "stores".
There has been a problem for a long time that I associated with shared hosting. Now that I'm on a dedicated host it's reared it's ugly head again - still.
This error does not happen if a human accesses the page. For people and all types of browsers there are no problem and for other spiders! Time of day doesn't matter either - it's just GoogleBot that seems to generate this error and it's always the same error, just a different "store" section that creates it.
From the Drupal log: