[Rails] Re: ActiveRecord::ConnectionNotEstablished

hi, this is the stack trace:

activerecord (3.1.3)
lib/active_record/connection_adapters/abstract/connection_pool.rb:409:in
`retrieve_connection'
activerecord (3.1.3)
lib/active_record/connection_adapters/abstract/connection_specification.rb:115:in
`retrieve_connection'
activerecord (3.1.3)
lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in
`connection'
activerecord (3.1.3) lib/active_record/query_cache.rb:67:in `rescue in
call'
activerecord (3.1.3) lib/active_record/query_cache.rb:61:in `call'
activerecord (3.1.3)
lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in
`call'
actionpack (3.1.3) lib/action_dispatch/middleware/callbacks.rb:29:in
`block in call'
activesupport (3.1.3) lib/active_support/callbacks.rb:392:in
`_run_call_callbacks'
activesupport (3.1.3) lib/active_support/callbacks.rb:81:in
`run_callbacks'
actionpack (3.1.3) lib/action_dispatch/middleware/callbacks.rb:28:in
`call'
actionpack (3.1.3) lib/action_dispatch/middleware/reloader.rb:68:in
`call'
rack (1.3.6) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.3) lib/action_dispatch/middleware/remote_ip.rb:48:in
`call'
actionpack (3.1.3)
lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.3) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.6) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.6) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.3)
lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.6) lib/rack/lock.rb:15:in `call'
actionpack (3.1.3) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.3) lib/rails/engine.rb:456:in `call'
rack (1.3.6) lib/rack/content_length.rb:14:in `call'
railties (3.1.3) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.6) lib/rack/handler/webrick.rb:59:in `service'
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
C:/Ruby192/lib/ruby/1.9.1/webrick/server.rb:183:in `block in
start_thread'

and I switch to mysql2
regards

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