Unable to get it working with redis

[GeminPatel]

(36.8ms) ROLLBACK Completed 500 Internal Server Error in 882ms (ActiveRecord: 533.4ms)

NoMethodError - undefined method hexists' for nil:NilClass Did you mean? exit: sunspot_index_queue (1.1.4) lib/sunspot/index_queue/entry/redis_impl.rb:120:inadd' sunspot_index_queue (1.1.4) lib/sunspot/index_queue/entry.rb:92:in enqueue' sunspot_index_queue (1.1.4) lib/sunspot/index_queue.rb:83:inindex' sunspot_index_queue (1.1.4) lib/sunspot/index_queue/session_proxy.rb:55:in block in index' sunspot_index_queue (1.1.4) lib/sunspot/index_queue/session_proxy.rb:54:inindex' sunspot (2.2.5) lib/sunspot.rb:184:in index' sunspot_rails (2.2.5) lib/sunspot/rails/searchable.rb:434:insolr_index' sunspot_rails (2.2.5) lib/sunspot/rails/searchable.rb:551:in perform_index_tasks' activesupport (4.2.5.1) lib/active_support/callbacks.rb:432:inblock in make_lambda' activesupport (4.2.5.1) lib/active_support/callbacks.rb:228:in block in halting_and_conditional' activesupport (4.2.5.1) lib/active_support/callbacks.rb:506:inblock in call' activesupport (4.2.5.1) lib/active_support/callbacks.rb:506:in call' activesupport (4.2.5.1) lib/active_support/callbacks.rb:92:inrun_callbacks' activesupport (4.2.5.1) lib/active_support/callbacks.rb:778:in _run_save_callbacks' activerecord (4.2.5.1) lib/active_record/callbacks.rb:302:increate_or_update' app/models/issue.rb:226:in create_or_update' activerecord (4.2.5.1) lib/active_record/persistence.rb:142:insave!' activerecord (4.2.5.1) lib/active_record/validations.rb:43:in save!' activerecord (4.2.5.1) lib/active_record/attribute_methods/dirty.rb:29:insave!' activerecord (4.2.5.1) lib/active_record/transactions.rb:291:in block in save!' activerecord (4.2.5.1) lib/active_record/transactions.rb:351:inblock in with_transaction_returning_status' activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in block in transaction' activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/transaction.rb:184:inwithin_new_transaction' activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in transaction' activerecord (4.2.5.1) lib/active_record/transactions.rb:220:intransaction' activerecord (4.2.5.1) lib/active_record/transactions.rb:348:in with_transaction_returning_status' activerecord (4.2.5.1) lib/active_record/transactions.rb:291:insave!' app/controllers/api/v1/tickets_controller.rb:32:in block in create' actionpack (4.2.5.1) lib/action_controller/metal/mime_responds.rb:212:inrespond_to' app/controllers/api/v1/tickets_controller.rb:29:in create' actionpack (4.2.5.1) lib/action_controller/metal/implicit_render.rb:4:insend_action' actionpack (4.2.5.1) lib/abstract_controller/base.rb:198:in process_action' actionpack (4.2.5.1) lib/action_controller/metal/rendering.rb:10:inprocess_action' actionpack (4.2.5.1) lib/abstract_controller/callbacks.rb:20:in block in process_action' activesupport (4.2.5.1) lib/active_support/callbacks.rb:117:incall' activesupport (4.2.5.1) lib/active_support/callbacks.rb:555:in block (2 levels) in compile' activesupport (4.2.5.1) lib/active_support/callbacks.rb:505:incall' activesupport (4.2.5.1) lib/active_support/callbacks.rb:498:in block (2 levels) in around' activesupport (4.2.5.1) lib/active_support/callbacks.rb:313:inblock (2 levels) in halting' lib/redmine/sudo_mode.rb:63:in sudo_mode' activesupport (4.2.5.1) lib/active_support/callbacks.rb:432:inblock in make_lambda' activesupport (4.2.5.1) lib/active_support/callbacks.rb:312:in block in halting' activesupport (4.2.5.1) lib/active_support/callbacks.rb:497:inblock in around' activesupport (4.2.5.1) lib/active_support/callbacks.rb:505:in call' activesupport (4.2.5.1) lib/active_support/callbacks.rb:92:inrun_callbacks' activesupport (4.2.5.1) lib/active_support/callbacks.rb:778:in _run_process_action_callbacks' activesupport (4.2.5.1) lib/active_support/callbacks.rb:81:inrun_callbacks' actionpack (4.2.5.1) lib/abstract_controller/callbacks.rb:19:in process_action' actionpack (4.2.5.1) lib/action_controller/metal/rescue.rb:29:inprocess_action' actionpack (4.2.5.1) lib/action_controller/metal/instrumentation.rb:32:in block in process_action' activesupport (4.2.5.1) lib/active_support/notifications.rb:164:inblock in instrument' activesupport (4.2.5.1) lib/active_support/notifications/instrumenter.rb:20:in instrument' activesupport (4.2.5.1) lib/active_support/notifications.rb:164:ininstrument' actionpack (4.2.5.1) lib/action_controller/metal/instrumentation.rb:30:in process_action' actionpack (4.2.5.1) lib/action_controller/metal/params_wrapper.rb:250:inprocess_action' activerecord (4.2.5.1) lib/active_record/railties/controller_runtime.rb:18:in process_action' actionpack (4.2.5.1) lib/abstract_controller/base.rb:137:inprocess' actionview (4.2.5.1) lib/action_view/rendering.rb:30:in process' rack-mini-profiler (0.10.1) lib/mini_profiler/profiling_methods.rb:102:inblock in profile_method' actionpack (4.2.5.1) lib/action_controller/metal.rb:196:in dispatch' actionpack (4.2.5.1) lib/action_controller/metal/rack_delegation.rb:13:indispatch' actionpack (4.2.5.1) lib/action_controller/metal.rb:237:in block in action' actionpack (4.2.5.1) lib/action_dispatch/routing/route_set.rb:74:indispatch' actionpack (4.2.5.1) lib/action_dispatch/routing/route_set.rb:43:in serve' actionpack (4.2.5.1) lib/action_dispatch/journey/router.rb:43:inblock in serve' actionpack (4.2.5.1) lib/action_dispatch/journey/router.rb:30:in serve' actionpack (4.2.5.1) lib/action_dispatch/routing/route_set.rb:815:incall' omniauth (1.3.1) lib/omniauth/strategy.rb:186:in call!' omniauth (1.3.1) lib/omniauth/strategy.rb:164:incall' omniauth (1.3.1) lib/omniauth/builder.rb:63:in call' rack-openid (1.4.2) lib/rack/openid.rb:98:incall' request_store (1.0.5) lib/request_store/middleware.rb:9:in call' rack (1.6.4) lib/rack/content_length.rb:15:incall' rack (1.6.4) lib/rack/etag.rb:24:in call' rack (1.6.4) lib/rack/conditionalget.rb:38:incall' rack (1.6.4) lib/rack/head.rb:13:in call' actionpack-xml_parser (1.0.2) lib/action_dispatch/xml_params_parser.rb:16:incall' actionpack (4.2.5.1) lib/action_dispatch/middleware/params_parser.rb:27:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/flash.rb:260:incall' rack (1.6.4) lib/rack/session/abstract/id.rb:225:in context' rack (1.6.4) lib/rack/session/abstract/id.rb:220:incall' actionpack (4.2.5.1) lib/action_dispatch/middleware/cookies.rb:560:in call' activerecord (4.2.5.1) lib/active_record/query_cache.rb:36:incall' activerecord (4.2.5.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/callbacks.rb:29:inblock in call' activesupport (4.2.5.1) lib/active_support/callbacks.rb:88:in __run_callbacks__' activesupport (4.2.5.1) lib/active_support/callbacks.rb:778:in_run_call_callbacks' activesupport (4.2.5.1) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (4.2.5.1) lib/action_dispatch/middleware/callbacks.rb:27:incall' actionpack (4.2.5.1) lib/action_dispatch/middleware/reloader.rb:73:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/remote_ip.rb:78:incall' better_errors (2.1.1) lib/better_errors/middleware.rb:84:in protected_app_call' better_errors (2.1.1) lib/better_errors/middleware.rb:79:inbetter_errors_call' better_errors (2.1.1) lib/better_errors/middleware.rb:57:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:incall' actionpack (4.2.5.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in call' railties (4.2.5.1) lib/rails/rack/logger.rb:38:incall_app' railties (4.2.5.1) lib/rails/rack/logger.rb:20:in block in call' activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:inblock in tagged' activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:26:in tagged' activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:intagged' railties (4.2.5.1) lib/rails/rack/logger.rb:20:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/request_id.rb:21:incall' rack (1.6.4) lib/rack/methodoverride.rb:22:in call' rack (1.6.4) lib/rack/runtime.rb:18:incall' rack (1.6.4) lib/rack/lock.rb:17:in call' actionpack (4.2.5.1) lib/action_dispatch/middleware/static.rb:116:incall' rack (1.6.4) lib/rack/sendfile.rb:113:in call' rack-mini-profiler (0.10.1) lib/mini_profiler/profiler.rb:278:incall' railties (4.2.5.1) lib/rails/engine.rb:518:in call' railties (4.2.5.1) lib/rails/application.rb:165:incall' railties (4.2.5.1) lib/rails/railtie.rb:194:in method_missing' thin (1.7.0) lib/thin/connection.rb:86:inblock in pre_process' thin (1.7.0) lib/thin/connection.rb:84:in pre_process' thin (1.7.0) lib/thin/connection.rb:50:inblock in process' eventmachine (1.2.0.1) lib/eventmachine.rb:1076:in `block in spawn_threadpool'

This is the log if it helps. Thanks for the gem and the help