SQLSTATE[42P07]: Duplicate table: 7 ERROR: relation "roles" already exists

After working on the project during the week I introduced some new tables, altered some columns but now that I've deployed the changes to github and then deploying those changes on Heroku, after accessing the site online, I get a 500 Server Error.

Went into the bash (heroku run bash) and ran php artisan migrate but I got this message:

In Connection.php line 678:

  SQLSTATE[42P07]: Duplicate table: 7 ERROR:  relation "roles" already exists
   (SQL: create table "roles" ("id" bigserial primary key not null, "name" va
  rchar(255) not null, "label" varchar(255) null, "created_at" timestamp(0) w
  ithout time zone null, "updated_at" timestamp(0) without time zone null))


In Connection.php line 471:

  SQLSTATE[42P07]: Duplicate table: 7 ERROR:  relation "roles" already exists

I rolled back the migrations and ran the migrations again but yet again Im still reading the same message above, how can I make this one go away?

At this point and because the nature of the project is NOT professional or for another person I could run fresh but I want to learn because on development I faced this error and let's say I never got to "fixing" it, all I did was to create another migration file and copied and pasted the code that I had. Thanks!