Fix for PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'base.type' in 'field list': SELECT base.fid AS fid, base.uid

gistfile1.php

$spec = array(
   'description' => 'The type of this file.',
   'type' => 'varchar',
   'length' => 50,
   'not null' => TRUE,
   // If the FILE_TYPE_NONE constant ever changes, then change the value here
   // too, and add an update function to deal with existing records. The
   // constant isn't used here, because there may be cases where this function
   // runs without the module file loaded.
   'default' => 'undefined',
 );
  $indexes_new = array('indexes' => array('file_type' => array('type')));

db_add_field('file_managed', 'type', $spec, $indexes_new);