rake db:migrate refinerycms get error

I have refinerycms 2.1.5 and running with sqlite3 all DDBB and works fine. Now i want migrate my app to Mysql, then I change into proyect:
config/database.yml:

development: &development
  adapter: mysql2
  host: 127.0.0.1
  username: root
  password: root
  database: refinerycms_develop
  port: 3306

test: &test
  adapter: mysql2
  host: 127.0.0.1
  username: root
  password: root
  database: refinerycms_test
  port: 3306

Into Gemfile :

group :development, :test do
  gem 'mysql2'
  gem 'activerecord-mysql2-adapter'
end

This is my gem list:

actionmailer (4.2.4, 4.2.3, 4.1.8, 3.2.22)
actionpack (4.2.4, 4.2.3, 4.1.8, 3.2.22)
actionview (4.2.4, 4.2.3, 4.1.8)
activejob (4.2.4, 4.2.3)
activemodel (4.2.4, 4.2.3, 4.1.8, 3.2.22)
activerecord (4.2.4, 4.2.3, 4.1.8, 3.2.22)
activerecord-jdbc-adapter (1.3.18)
activerecord-jdbcmysql-adapter (1.3.18)
activerecord-mysql-adapter (0.0.1)
activerecord-mysql2-adapter (0.0.3)
activerecord-sqlserver-adapter (4.1.0)
activeresource (3.2.22)
activesupport (4.2.4, 4.2.3, 4.1.8, 3.2.22)
acts_as_indexed (0.8.3)
addressable (2.3.8)
arel (6.0.3, 5.0.1.20140414130214, 3.0.3)
awesome_nested_set (3.0.2, 2.1.6)
babosa (1.0.2)
bcrypt (3.1.10 x86-mingw32)
bcrypt-ruby (3.1.5 x86-mingw32)
bigdecimal (1.2.0)
binding_of_caller (0.7.2)
builder (3.2.2, 3.0.4)
bundler (1.10.6, 1.7.7)
byebug (6.0.2)
capybara (2.4.4)
cliver (0.3.2)
coffee-rails (4.1.0, 3.2.2)
coffee-script (2.4.1, 2.3.0)
coffee-script-source (1.9.1.1, 1.8.0)
coveralls (0.8.2)
database_cleaner (1.3.0)
debug_inspector (0.0.2)
decorators (2.0.1, 1.0.5)
devise (3.5.2, 2.2.8)
diff-lcs (1.2.5)
docile (1.1.5)
domain_name (0.5.24)
dragonfly (1.0.11, 0.9.15)
erubis (2.7.0)
execjs (2.6.0, 2.2.2)
factory_girl (4.4.0)
factory_girl_rails (4.4.1)
ffi (1.9.10 x86-mingw32)
friendly_id (5.1.0, 4.0.10.1)
generator_spec (0.9.3)
globalid (0.3.6)
globalize (5.0.1, 3.1.0)
hike (1.2.3)
http-cookie (1.0.2)
i18n (0.7.0, 0.6.11)
io-console (0.4.2)
jbuilder (2.3.1)
jdbc-mysql (5.1.36)
journey (1.0.4)
jquery-rails (4.0.5, 3.1.2, 2.3.0)
jquery-ui-rails (5.0.5)
json (1.8.3, 1.7.7)
launchy (2.4.3)
loofah (2.0.3)
mail (2.6.3, 2.5.4)
mime-types (2.6.2, 2.4.3, 1.25.1)
mini_portile (0.6.2)
minitest (5.8.0, 5.4.3, 4.3.2)
multi_json (1.11.2, 1.10.1)
mysql (2.9.1 x86-mingw32)
mysql2 (0.4.1 x86-mingw32, 0.4.0 x86-mingw32, 0.3.20 x86-mingw32)
netrc (0.10.3)
nokogiri (1.6.6.2 x86-mingw32)
orm_adapter (0.5.0)
pg (0.17.1 x86-mingw32)
polyglot (0.3.5)
psych (2.0.0)
quiet_assets (1.1.0)
rack (1.6.4, 1.5.2, 1.4.7)
rack-cache (1.2)
rack-ssl (1.3.4)
rack-test (0.6.3, 0.6.2)
rails (4.2.4, 4.2.3, 4.1.8, 3.2.22)
rails-deprecated_sanitizer (1.0.3)
rails-dom-testing (1.0.7)
rails-html-sanitizer (1.0.2)
rails-i18n (4.0.5, 0.7.4)
railties (4.2.4, 4.2.3, 4.1.8, 3.2.22)
rake (10.4.2, 0.9.6)
rb-readline (0.5.1)
rdoc (4.2.0, 4.0.0, 3.12.2)
refinerycms (2.1.5)
refinerycms-acts-as-indexed (2.0.1, 1.0.0)
refinerycms-authentication (2.1.5)
refinerycms-authentication-devise (1.0.4)
refinerycms-core (2.1.5)
refinerycms-dashboard (2.1.5)
refinerycms-i18n (3.0.1, 2.1.0)
refinerycms-images (2.1.5)
refinerycms-page-images (2.1.1, 1.0.4)
refinerycms-page-resources (0.0.1)
refinerycms-pages (2.1.5)
refinerycms-resources (2.1.5)
refinerycms-wymeditor (1.0.6)
responders (2.1.0)
rest-client (2.0.0.rc2 x86-mingw32, 1.8.0 x86-mingw32)
routing-filter (0.5.1, 0.3.1)
rspec-core (3.3.2)
rspec-expectations (3.3.1)
rspec-mocks (3.3.2)
rspec-rails (3.3.3)
rspec-retry (0.4.4)
rspec-support (3.3.0)
rubygems-update (2.4.8)
rubyzip (1.1.6)
sass (3.4.18, 3.2.19)
sass-rails (5.0.4, 4.0.5, 3.2.6)
sdoc (0.4.1)
seo_meta (2.0.0.rc.1, 1.4.0)
simplecov (0.10.0)
simplecov-html (0.10.0)
speakingurl-rails (1.1.5)
spring (1.4.0)
spring-commands-rspec (1.0.4)
sprockets (3.3.4, 2.12.3, 2.2.3)
sprockets-rails (2.3.3, 2.2.1)
sqlite3 (1.3.10 x86-mingw32)
sqlite3-ruby (1.3.3)
term-ansicolor (1.3.2)
test-unit (2.0.0.0)
thor (0.19.1)
thread_safe (0.3.5, 0.3.4)
tilt (2.0.1, 1.4.1)
tins (1.6.0)
tiny_tds (0.6.2 x86-mingw32)
treetop (1.4.15)
truncate_html (0.9.3)
turbolinks (2.5.3)
tzinfo (1.2.2, 0.3.44)
tzinfo-data (1.2015.6)
uglifier (2.7.2)
unf (0.1.4)
unf_ext (0.0.7.1 x86-mingw32)
warden (1.2.3)
web-console (2.2.1)
websocket-driver (0.6.2)
websocket-extensions (0.1.2)
will_paginate (3.0.7)
xpath (2.0.0)
yaml_db (0.3.0)
zilch-authorisation (0.0.1)

I get this error

 rake aborted!
 NoMethodError: undefined method 'accept' for nil:NilClass
 Task: TOP => db:migrate