Parameter comment must be on the next line at position 1
As it clearly says Parameter comment must be on the next line at position 1...

Correct way of documenting your function is..

/**
 * Fetch node object properties. 
 *
 * @param object $node 
 *   contains information about campaign.
 * 
 * @return array
 *   Webform properties.
 */


For more information on commenting standards check Drupal Coding Standards Documentation in D.O