# Error while running migration **URL:** \ **Category:** Ruby\ **Created:** [May 25, 2009, 7:04am UTC](https://www.ruby-forum.com/t/error-while-running-migration/168730 "2009-05-25T07:04:33Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![virendra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/e68b1a/32.png) [@virendra](https://www.ruby-forum.com/u/virendra)\ **Post date:** [May 25, 2009, 7:04am UTC](https://www.ruby-forum.com/t/error-while-running-migration/168730/1 "2009-05-25T07:04:33Z")
Hello I generate a scaffold for the User it created a migration for me for user table now when iam trying to run that migration its give me a error a ran the migration command with --trace to crack down the source of the error but it should me this bunch of things and its not getting to my head \*\* Invoke db:migrate (first\_time) \*\* Invoke environment (first\_time) \*\* Execute environment \*\* Execute db:migrate rake aborted! Unknown database ‘[my\_database\_name]\_development’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/mysql\_adapter.rb:576:in `real_connect' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/mysql_adapter.rb:576:in`connect’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/mysql\_adapter.rb:204:in `initialize' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/mysql_adapter.rb:76:in`new’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/mysql\_adapter.rb:76:in `mysql_connection' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:223:in`send’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_pool.rb:223:in `new_connection' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:245:in`checkout\_new\_connection’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_pool.rb:188:in `checkout' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:184:in`loop’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_pool.rb:184:in `checkout' /PROGRA~1/BITNAM~1/ruby/lib/ruby/1.8/monitor.rb:238:in`synchronize’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_pool.rb:183:in `checkout' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:98:in`connection’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_pool.rb:326:in `retrieve_connection' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in`retrieve\_connection’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/connection\_adapters/abstract/connection\_specification.rb:115:in `connection' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:435:in`initialize’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/migration.rb:400:in `new' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:400:in`up’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active\_record/migration.rb:383:in `migrate' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/tasks/databases.rake:116 /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:617:in`call’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:617:in `execute' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:612:in`each’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:612:in `execute' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:578:in`invoke\_with\_call\_chain’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/1.8/monitor.rb:238:in `synchronize' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:571:in`invoke\_with\_call\_chain’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:564:in `invoke' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2027:in`invoke\_task’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2005:in `top_level' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2005:in`each’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2005:in `top_level' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2044:in`standard\_exception\_handling’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:1999:in `top_level' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:1977:in`run’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:2044:in `standard_exception_handling' /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:1974:in`run’ /PROGRA~1/BITNAM~1/ruby/lib/ruby/gems/1.8/gems/rake-0.8.4/bin/rake:31 /PROGRA~1/BITNAM~1/ruby/bin/rake:19:in `load’ /PROGRA~1/BITNAM~1/ruby/bin/rake: any idea thank anyway ---
**Author:** ![virendra](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/e68b1a/32.png) [@virendra](https://www.ruby-forum.com/u/virendra)\ **Post date:** [May 25, 2009, 10:42am UTC](https://www.ruby-forum.com/t/error-while-running-migration/168730/2 "2009-05-25T10:42:45Z")
Virendra N. wrote: > Unknown database ‘[my\_database\_name]\_development’ Read that error message - it tells you exactly the problem. Look also in your config/database.yml. But note that this is not the Rails mailing list, so you’d be better posting any follow-up questions there.