    # File lib/chef/solr/application/solr.rb, line 176
            def assert_valid_schema!
              unless valid_schema_name? && valid_schema_version?
                Chef::Log.fatal "Your Chef Solr installation needs to be upgraded."
                Chef::Log.fatal "Expected schema version #{Chef::Solr::SCHEMA_VERSION} but version #{solr_schema_version} is installed."
                Chef::Log.fatal "Use chef-solr-installer to upgrade your Solr install after backing up your data."
                exit 1
              end
            end