edit Style Variable Editor error

[Liton khan]

i need to change my style css not changes my style error

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

Warning: Declaration of vB_DataManager_StyleVar::save() should be compatible with vB_DataManager::save($doquery = true, $delayed = false, $affected_rows = false, $replace = false, $ignore = false) in ..../includes/class_dm_stylevar.php on line 615