how to use custom field names of user table in auth in laravel 5.5

I have a field of user_email in tbl_users instead of default email field in user table. I am facing an error while registration, even I have changed the User model like protected $table = 'tbl_users'; but still got the below error.

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'mydb.users' doesn't exist (SQL: select count(*) as aggregate from users where email = test@test.com)

why is it still users table?