Rails - Aug 2012 - NoMethodError: undefined method `accept' for nil:NilClass

Here''s the trace,

NoMethodError: undefined method `accept'' for nil:NilClass
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in
`to_sql''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:89:in
`insert''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in
`insert''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/relation.rb:66:in
`insert''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/persistence.rb:363:in
`create''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/timestamp.rb:57:in
`create''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/callbacks.rb:268:in
`block in create''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:403:in
`_run__3940325652772678349__create__4360101769414794529__callbacks''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:405:in
`__run_callback''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:385:in
`_run_create_callbacks''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:81:in
`run_callbacks''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/callbacks.rb:268:in
`create''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/persistence.rb:344:in
`create_or_update''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/callbacks.rb:264:in
`block in create_or_update''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:403:in
`_run__3940325652772678349__save__4360101769414794529__callbacks''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.3/lib/active_support/callbacks.rb:405:in
`__run_callback''
... 4 levels...
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/validations.rb:50:in
`save''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/attribute_methods/dirty.rb:22:in
`save''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:241:in
`block (2 levels) in save''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:295:in
`block in with_transaction_returning_status''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in
`transaction''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:208:in
`transaction''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:293:in
`with_transaction_returning_status''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:241:in
`block in save''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:252:in
`rollback_active_record_state!''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.3/lib/active_record/transactions.rb:240:in
`save''
from (irb):7
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.3/lib/rails/commands/console.rb:47:in
`start''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.3/lib/rails/commands/console.rb:8:in
`start''
from 
/Users/blaine/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.3/lib/rails/commands.rb:41:in
`<top (required)>''
from script/rails:6:in `require''
from script/rails:6:in `<main>''ruby-1.9.2-p290 :008 > ^D

From other sources on the web I found I should run the following,

$ bundle update activerecord-mysql2-adapter mysql2

I had the latest versions of these gems already, but I get the same error.

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I fixed the problem by removing activerecord-mysql2-adapter from my Gemfile 
and using only mysql2.

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