codeigniter fatal error, trying to read database
The above error is occuring because the value of $query is NULL or a non-object. This is likely because get('users') failed to return a proper query.
Make sure your database has a table users and that your database library is initialized and configured correctly.
I agree with Aren.
You should implement some sort of failure checking to gracefully handle this error.
$result = $this->Users_model->get_records();if ($result == null) echo "error message";else{ // do your normal page handling}