Feeds_ui ERROR: Class 'FeedsConfigurable' not found

This looks very weird, may be a PHP 5.3 issue? Are the permissions on the module correct?

Drupal 6.19
Feeds 6.x-1.x-dev (2010-Aug-31)
ctools 6.x-1.x-dev (2010-Sep-01)

PHP 5.3.2

I checked the permissions on the module. It seems OK.

However, I get these.

array_intersect_key() [function.array-intersect-key]: Argument #1 is not an array in /var/www/aristoymobi/sites/all/modules/feeds/includes/FeedsConfigurable.inc on line 126.

array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/aristoymobi/sites/all/modules/feeds/includes/FeedsConfigurable.inc on line 124.

Here is my feeds configuration;

$feeds_importer = new stdClass;
$feeds_importer->disabled = FALSE; /* Edit this to true to make a default feeds_importer disabled initially */
$feeds_importer->api_version = 1;
$feeds_importer->id = 'article_feed';
$feeds_importer->config = array(
  'name' => 'Article Feed',
  'description' => 'A feed of Article',
  'fetcher' => array(
    'plugin_key' => 'MailhandlerFetcher',
    'config' => array(),
  ),
  'parser' => array(
    'plugin_key' => 'MailhandlerParser',
    'config' => array(),
  ),
  'processor' => array(
    'plugin_key' => 'MailhandlerNodeProcessor',
    'config' => array(
      'content_type' => 'article',
      'mappings' => array(
        0 => array(
          'source' => 'subject',
          'target' => 'title',
          'unique' => FALSE,
        ),
        1 => array(
          'source' => 'origbody',
          'target' => 'body',
          'unique' => FALSE,
        ),
        2 => array(
          'source' => 'date',
          'target' => 'created',
          'unique' => FALSE,
        ),
        3 => array(
          'source' => 'sender',
          'target' => 'threading',
          'unique' => FALSE,
        ),
      ),
    ),
  ),
  'content_type' => 'article',
  'update' => 0,
  'import_period' => '1800',
  'expire_period' => 3600,
  'import_on_create' => 1,
);

The warnings come from my stupid mistakes of my configuration.
It's nothing to concern with feeds module at all.
It works well now. Sorry!!

Please, help me!

error description:

Fatal error: Class name must be a valid object or a string in /home/ferguson/public_html/sites/all/modules/feeds/includes/FeedsConfigurable.inc on line 60

Thanks

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