error while running install.sql in community auth

I did what you suggested. I am still getting:
A Database Error Occurred
Error Number: 1054
Unknown column 'user_id' in 'where clause'
SELECT * FROM `users` WHERE `user_id` = 779771974
Filename: C:/xampp/htdocs/sub_crud2/system/database/DB_driver.php
Line Number: 691

when I run localhost/Examples/create_user from the address bar on the browser.
I have traced through the error to the call to
$user_data['user_id'] = $this->examples_model->get_unused_id();

at the point of calling this line above, $this is full of data. Yet when I set a breakpoint in the function get_unused_id()and I look at $this, it is empty. So the line in get_unused_id():

$query = $this->db->where( 'user_id', $random_unique_int )
->get_where( $this->db_table('user_table') );

fails because $this only has one value which is "acl". I have no idea why $this is empty or what acl is.

Any idea what is going on?

proof that an old dog can learn new tricks