data_fabric 1.3.3 not working with rails 3.1.1

I tried to use data_fabric with rails 3.1.1 but getting error as.... uninitialized constant DataFabric::ConnectionProxy::RAILS_ENV.
While the data_fabric development i.e. https://github.com/bpot/data_fabric.git. is working with rails 3.1.1. But It gives error while executing create statements from the migration file.
