Error Message appearing when publishing

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HiGuys,
Has anyone encountered this error message before?:
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Fatal error: method_exists() [<a href='function.method-exists'>function.method-exists</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition &quot;BackgroundImageBlockController&quot; of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/itsnotro/public_html/concrete/libraries/database_indexed_search.php on line 113

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I get it whenever I change the 'design' of a an element on the page and then try to publish.

cheers
Paul

craftyCS
 
Arismoon replied on at Permalink Reply
Arismoon
Yeah, I have this issue right now. If I find a solution I will post it for you.
Arismoon replied on at Permalink Best Answer Reply
Arismoon
I resolved this issue.

I changed the name of my custom block to match the formal naming convention, i.e. part1_part2.

... I didn't want to have to reload my package though so I went into the database and changed the handle in the BlockTypes table and everything has been good since then.