Has anyone been able to run this?

Got the following error from spec test. Can anyone help?

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF...........WARNING: Using the raise_error matcher without providing a specific error
or message risks false positives, since raise_error will match when Ruby raises a NoMethodError, NameError or ArgumentError, potentially allowing the expectation to pass without even executing the method you are intending to call. Instead consider providing a specific error class or message. This message can be supressed by setting: RSpec::Expectations.configuration.warn_about_potential_false _positives = false. Called from /home/osboxes/Documents/projects/rcs-common/spec/updater_spec.rb:64:in `block (3 levels) in <module:Up
dater>'.
..

Failures:

1. File#eof? is false when there are bytes to read
   Failure/Error: let(:file) { bucket.get(bucket.put(content)) }
   NoMethodError:
   undefined method `session' for RCS::Mongoid:Module

   ./lib/rcs-common/gridfs.rb:115:in`session'

   ./lib/rcs-common/gridfs.rb:123:in `chunks_collection'

   ./lib/rcs-common/gridfs.rb:245:in`setup'

   ./lib/rcs-common/gridfs.rb:268:in `write'

   ./lib/rcs-common/gridfs.rb:145:in`put'

   ./spec/gridfs_spec.rb:108:in `block (2 levels) in module:GridFS'

   ./spec/gridfs_spec.rb:113:in`block (3 levels) in module:GridFS'