使用twitter gem - rails app在Twitter上发布

Question

我正在使用rails构建一个应用程序，允许用户使用他们的Twitter帐户授权和连接到Twitter API。登录工作，但我有帖子的问题（我正在使用this gem）：当我尝试运行rails db：migrate时出现此错误：

$ rails db:migrate
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::DuplicateTable: ERROR:  relation "tweets" already exists
: CREATE TABLE "tweets" ("id" serial primary key, "user_id" integer, "body" text, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
C:/Users/......./db/migrate/20170419185735_create_tweets.rb:3:in `change'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
ActiveRecord::StatementInvalid: PG::DuplicateTable: ERROR:  relation "tweets" already exists
: CREATE TABLE "tweets" ("id" serial primary key, "user_id" integer, "body" text, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
C:/Users/......./db/migrate/20170419185735_create_tweets.rb:3:in `change'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
PG::DuplicateTable: ERROR:  relation "tweets" already exists
C:/Users/......./db/migrate/20170419185735_create_tweets.rb:3:in `change'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
== 20170419185735 CreateTweets: migrating =====================================
-- create_table(:tweets)

我是rails的新手，所以任何帮助都会受到赞赏！