PG:：DuplicateTable:错误：关系“posts”已存在

当我运行rake db:migrate时，我得到以下输出：

==20141219011612 CreatePost:迁移=======================================
–创建“表格”（“帖子”）rake中止！StandardError:发生错误，此迁移和所有后续迁移已取消：
==20141219011612后置：迁移=======================================
–创建“表格”（“帖子”）rake中止！StandardError:发生错误，此迁移和所有后续迁移已取消：

PG:：DuplicateTable:错误：关系；职位；已存在：创建
表「；职位；（“id”序列主键、“post”文本、“发布日期”；
时间戳，“创建”时间戳，“更新”时间戳）
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/connection\u adapters/postgresql/database\u语句。rb:128:in
async_exec'/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql/database_statements.rb:128:inblock in execute’
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/connection\u adapters/abstract\u adapter.rb:373:inblock in/home/admin/.rvm/gems/ruby-2.1.5/gems/activesupport-4.1.8/lib/active\u support/notifications/instrumenter.rb:20:ininstrument
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/connection\u adapters/abstract\u adapter.rb:367:inlog'/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/connection\u adapters/postgresql/database\u语句。rb:127:inexecute’
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/connection\u adapters/abstract/schema\u statements.rb:205:in
create_table'/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active_record/migration.rb:649:in方法中的块缺失’
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/migration.rb:621:in
block in say_with_time'/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active_record/migration.rb:621:insay_with_time’
/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/migration.rb:641:in
`方法_缺失’

migrate'/home/admin/.rvm/gems/ruby-2.1.5/gems/activerecord-4.1.8/lib/active\u record/railties/databases.rake:34:inblock（2级）in&lt；顶部（必需）&gt；’任务：TOP=&gt；db:迁移（请参见
通过使用–trace运行任务完成完整跟踪

我不明白这是怎么可能的，因为在方案文件中我并没有post表