[Rails] “undefined method `accept' for nil:NilClass”

I am getting "undefined method `accept' for nil:NilClass" error while running db:migrate. My configuration is: 

    Rails 3.2.8

    MySql 5.1.54

    OS : win7

    ruby : 1.9.2

my gems list command output:

    F:\RailsApp\MyApp>gem list

    

    *** LOCAL GEMS ***

    

    actionmailer (3.2.8)

    actionpack (3.2.8)

    activemodel (3.2.8, 3.1.0)

    activerecord (3.2.8)

    activeresource (3.2.8)

    activesupport (3.2.8, 3.1.0)

    arel (3.0.2)

    bcrypt-ruby (3.0.1 x86-mingw32)

    builder (3.0.0)

    bundler (1.1.5)

    coffee-rails (3.2.2)

    coffee-script (2.2.0)

    coffee-script-source (1.3.3)

    erubis (2.7.0)

    execjs (1.4.0)

    hike (1.2.1)

    i18n (0.6.0)

    journey (1.0.4)

    jquery-rails (2.0.2)

    json (1.7.4)

    mail (2.4.4)

    mime-types (1.19)

    minitest (1.6.0)

    multi_json (1.3.6)

    mysql (2.8.1 x86-mingw32)

    mysql2 (0.3.11 x86-mingw32, 0.2.6 x86-mingw32)

    polyglot (0.3.3)

    rack (1.4.1, 1.3.6)

    rack-cache (1.2)

    rack-ssl (1.3.2)

    rack-test (0.6.1)

    rails (3.2.8)

    railties (3.2.8)

    rake (0.9.2.2, 0.8.7)

    rdoc (3.12, 2.5.8)

    sass (3.2.0)

    sass-rails (3.2.5)

    sprockets (2.1.3)

    thor (0.15.4)

    tilt (1.3.3)

    treetop (1.4.10)

    tzinfo (0.3.33)

    uglifier (1.2.7)

I have also copy the %MYSQLPATH%/bin/libmySQL.dll file to %RUBYHOME%/bin folder.

Can anybody pleas help me to solve this problem?

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