Rails 3 Haml 4 Missing Template Error

I am getting a Missing Template error on update action.

I also not sure if this is due to haml.

I am using ruby 2.5.0, rails 3.2.12, HAML 4.0.7 and html-rails 0.4

here is the complete error log.

ActionView::MissingTemplate (Missing template posts/update, application/update with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :slim, :haml]}. Searched in: * "/home/my_rails_app/app/views" * "/usr/local/rvm/gems/ruby-2.5.0/gems/kaminari-0.17.0/app/views" * "/usr/local/rvm/gems/ruby-2.5.0/gems/devise_invitable-1.6.1/app/views" * "/usr/local/rvm/gems/ruby-2.5.0/gems/devise-3.5.10/app/views" ): actionpack (3.2.12) lib/action_view/path_set.rb:58:in `find' actionpack (3.2.12) lib/action_view/lookup_context.rb:109:in `find' actionpack (3.2.12) lib/action_view/renderer/abstract_renderer.rb:3:in `find_template' actionpack (3.2.12) lib/action_view/renderer/template_renderer.rb:34:in `determine_template' actionpack (3.2.12) lib/action_view/renderer/template_renderer.rb:10:in `render' actionpack (3.2.12) lib/action_view/renderer/renderer.rb:36:in `render_template' actionpack (3.2.12) lib/action_view/renderer/renderer.rb:17:in `render' actionpack (3.2.12) lib/abstract_controller/rendering.rb:110:in `_render_template' actionpack (3.2.12) lib/action_controller/metal/streaming.rb:225:in `_render_template' actionpack (3.2.12) lib/abstract_controller/rendering.rb:103:in `render_to_body' actionpack (3.2.12) lib/action_controller/metal/renderers.rb:28:in `render_to_body' actionpack (3.2.12) lib/action_controller/metal/compatibility.rb:50:in `render_to_body' actionpack (3.2.12) lib/abstract_controller/rendering.rb:88:in `render' actionpack (3.2.12) lib/action_controller/metal/rendering.rb:16:in `render' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' activesupport (3.2.12) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' /usr/local/rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/benchmark.rb:308:in `realtime' activesupport (3.2.12) lib/active_support/core_ext/benchmark.rb:5:in `ms' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:40:in `block in render' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:39:in `render' wicked_pdf (1.1.0) lib/wicked_pdf/pdf_helper.rb:42:in `render_with_wicked_pdf' actionpack (3.2.12) lib/action_controller/metal/implicit_render.rb:10:in `default_render' actionpack (3.2.12) lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack (3.2.12) lib/abstract_controller/base.rb:167:in `process_action' actionpack (3.2.12) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (3.2.12) lib/abstract_controller/callbacks.rb:18:in `block in process_action' activesupport (3.2.12) lib/active_support/callbacks.rb:458:in `_run__252879580124370649__process_action__1241135802789983149__callbacks' activesupport (3.2.12) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.12) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' activesupport (3.2.12) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.12) lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack (3.2.12) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' activesupport (3.2.12) lib/active_support/notifications.rb:123:in `block in instrument' activesupport (3.2.12) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (3.2.12) lib/active_support/notifications.rb:123:in `instrument' actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:29:in `process_action' actionpack (3.2.12) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' actionpack (3.2.12) lib/abstract_controller/base.rb:121:in `process' actionpack (3.2.12) lib/abstract_controller/rendering.rb:45:in `process' actionpack (3.2.12) lib/action_controller/metal.rb:203:in `dispatch' actionpack (3.2.12) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' actionpack (3.2.12) lib/action_controller/metal.rb:246:in `block in action' actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:36:in `call' journey (1.0.4) lib/journey/router.rb:68:in `block in call' journey (1.0.4) lib/journey/router.rb:56:in `each' journey (1.0.4) lib/journey/router.rb:56:in `call' actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:601:in `call' mongoid (3.1.7) lib/rack/mongoid/middleware/identity_map.rb:34:in `block in call' mongoid (3.1.7) lib/mongoid/unit_of_work.rb:39:in `unit_of_work' mongoid (3.1.7) lib/rack/mongoid/middleware/identity_map.rb:34:in `call' exception_notification (4.1.1) lib/exception_notification/rack.rb:32:in `call' warden (1.2.7) lib/warden/manager.rb:36:in `block in call' warden (1.2.7) lib/warden/manager.rb:35:in `catch' warden (1.2.7) lib/warden/manager.rb:35:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' rack (1.4.7) lib/rack/etag.rb:23:in `call' rack (1.4.7) lib/rack/conditionalget.rb:35:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/head.rb:14:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/params_parser.rb:21:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/flash.rb:242:in `call' rack (1.4.7) lib/rack/session/abstract/id.rb:210:in `context' rack (1.4.7) lib/rack/session/abstract/id.rb:205:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/cookies.rb:341:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' activesupport (3.2.12) lib/active_support/callbacks.rb:405:in `_run__3905902162550555954__call__2684879384500324798__callbacks' activesupport (3.2.12) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.12) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' activesupport (3.2.12) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.12) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/reloader.rb:65:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' railties (3.2.12) lib/rails/rack/logger.rb:32:in `call_app' railties (3.2.12) lib/rails/rack/logger.rb:16:in `block in call' activesupport (3.2.12) lib/active_support/tagged_logging.rb:22:in `tagged' railties (3.2.12) lib/rails/rack/logger.rb:16:in `call' request_store (1.4.1) lib/request_store/middleware.rb:19:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/request_id.rb:22:in `call' rack (1.4.7) lib/rack/methodoverride.rb:21:in `call' rack (1.4.7) lib/rack/runtime.rb:17:in `call' activesupport (3.2.12) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.4.7) lib/rack/lock.rb:15:in `call' actionpack (3.2.12) lib/action_dispatch/middleware/static.rb:62:in `call' railties (3.2.12) lib/rails/engine.rb:479:in `call' railties (3.2.12) lib/rails/application.rb:223:in `call' railties (3.2.12) lib/rails/railtie/configurable.rb:30:in `method_missing' unicorn (5.4.0) lib/unicorn/http_server.rb:606:in `process_client' unicorn (5.4.0) lib/unicorn/http_server.rb:701:in `worker_loop' unicorn (5.4.0) lib/unicorn/http_server.rb:549:in `spawn_missing_workers' unicorn (5.4.0) lib/unicorn/http_server.rb:142:in `start' unicorn (5.4.0) bin/unicorn:126:in `<top (required)>' /usr/local/rvm/gems/ruby-2.5.0/bin/unicorn:23:in `load' /usr/local/rvm/gems/ruby-2.5.0/bin/unicorn:23:in `<main>' /usr/local/rvm/gems/ruby-2.5.0/bin/ruby_executable_hooks:24:in `eval' /usr/local/rvm/gems/ruby-2.5.0/bin/ruby_executable_hooks:24:in `<main>'