uninitialized class variable @@env in OCI8

Can anyone help me with the uninitialized class variable @@env in OCI8 error raised in my app\views\xxxx index.html.erb file

Thanks in advance

Below is the code and the result of bundle show. I am using Windows 7

<h1>Listing comics</h1>

<table>   <tr>     <th>Title</th>     <th>Issue</th>     <th>Publisher</th>     <th></th>     <th></th>     <th></th>   </tr>

<% @comics.each do |comic| %>   <tr>     <td><%= comic.title %></td>     <td><%= comic.issue %></td>     <td><%= comic.publisher %></td>     <td><%= link_to 'Show', comic %></td>     <td><%= link_to 'Edit', edit_comic_path(comic) %></td>     <td><%= link_to 'Destroy', comic, :confirm => 'Are you sure?', :method => :delete %></td>   </tr> <% end %> </table>

Gems included by the bundle   * abstract (1.0.0)   * actionmailer (3.0.8)   * actionpack (3.0.8)   * activemodel (3.0.8)   * activerecord (3.0.8)   * activeresource (3.0.8)   * activesupport (3.0.8)   * arel (2.0.10)   * builder (2.1.2)   * bundler (1.0.15)   * erubis (2.6.6)   * i18n (0.5.0)   * mail (2.2.19)   * mime-types (1.16)   * polyglot (0.3.1)   * rack (1.2.3)   * rack-mount (0.6.14)   * rack-test (0.5.7)   * rails (3.0.8)   * railties (3.0.8)   * rake (0.9.2)   * ruby-oci8 (2.0.6)   * thor (0.14.6)   * treetop (1.4.9)   * tzinfo (0.3.28)