header picture errors

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I'm getting an error when I try to save my forums header logo in the stylevar editor. The error flashes by too fast for me to catch. Something on line 233 is not compatible.

any ideas? help?

--------------- Added [DATE]1390419259[/DATE] at [TIME]1390419259[/TIME] ---------------

here's the error:

Warning: Declaration of vB_DataManager_StyleVarDefn::delete() should be compatible with that of vB_DataManager::delete() in ..../includes/class_dm_stylevar.php on line 233

Warning: Declaration of vB_DataManager_StyleVar::save() should be compatible with that of vB_DataManager::save() in ..../includes/functions_log_error.php on line 615