rake:db migrate not working

[greengrass]

:rake db:migrate --trace
(in /home/bob/Desktop/shop)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
Could not load extension from file: spree_multi_domain_extension.

<NameError: uninitialized constant SpreeMultiDomainExtension>

** Execute db:migrate

hi, I have called this extension multi_domain and spree_multi_domain in the preinitializer.rb i tried both names , i also tried spree gem 0.10.0 and 0.11.0 cant get it to migrate,
can someone point me it the right direction or if its not possible for me to fix is there a similar multi domain extension that should work for me, thanks

[RyanFerretti]

I'm seeing the same results just following the installation instructions on the wiki. I am running the spree 0.11.1 gem and I get the message "Could not load extension from file: multi_domain_extension" when I run db:migrate

[mfilipe]

I have the same problem here. Does anyone found a solution?