500 error

gistfile1.txt

2014-09-22 11:14:52 -0400 (26874) Rendering 500 page due to exception: #<NoMethodError: undefined method `label' for nil:NilClass> - ["/opt/heracles/deploy/scholarsphere/shared/bundle/ruby/2.1.0/gems/blacklight-5.5.3/app/helpers/blacklight/configuration_helper_behavior.rb:85:in `facet_field_label'", "/opt/heracles/deploy/scholarsphere/shared/bundle/ruby/2.1.0/gems/blacklight-5.5.3/app/helpers/blacklight/render_constraints_helper_behavior.rb:72:in `block in render_filter_element'", "/opt/heracles/deploy/scholarsphere/shared/bundle/ruby/2.1.0/gems/blacklight-5.5.3/app/helpers/blacklight/render_constraints_helper_behavior.rb:70:in `map'", "/opt/heracles/deploy/scholarsphere/shared/bundle/ruby/2.1.0/gems/blacklight-5.5.3/app/helpers/blacklight/render_constraints_helper_behavior.rb:70:in `render_filter_element'", "/opt/heracles/deploy/scholarsphere/shared/bundle/ruby/2.1.0/gems/blacklight-5.5.3/app/helpers/blacklight/render_constraints_helper_behavior.rb:54:in `block in 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