Uninstalling...

There is a call to uninstall schema, but no schema is defined. This leads to errors when the module is uninstalled.

Solution, either define an empty schema or to remove this line.

<?php
/**
 * Implementation of hook_schema().
 */
function imagefield_assist_schema() {
  return array();
}

/**
 * Implementation of hook_install().
 */
function imagefield_assist_install() {
  drupal_install_schema('imagefield_assist');
}


/**
 * Implementation of hook_uninstall().
 * @todo list all variables
 */
function imagefield_assist_uninstall() {
  drupal_uninstall_schema('imagefield_assist');
  // ...
}


?>