Error after submitting contact form

[nasim31]

ActionController::RoutingError (No route matches [POST] "/"):

actionpack (5.2.2) lib/action_dispatch/middleware/debug_exceptions.rb:65:in call' web-console (3.7.0) lib/web_console/middleware.rb:135:in call_app'
web-console (3.7.0) lib/web_console/middleware.rb:30:in block in call' web-console (3.7.0) lib/web_console/middleware.rb:20:in catch'
web-console (3.7.0) lib/web_console/middleware.rb:20:in call' actionpack (5.2.2) lib/action_dispatch/middleware/show_exceptions.rb:33:in call'
railties (5.2.2) lib/rails/rack/logger.rb:38:in call_app' railties (5.2.2) lib/rails/rack/logger.rb:26:in block in call'
activesupport (5.2.2) lib/active_support/tagged_logging.rb:71:in block in tagged' activesupport (5.2.2) lib/active_support/tagged_logging.rb:28:in tagged'
activesupport (5.2.2) lib/active_support/tagged_logging.rb:71:in tagged' railties (5.2.2) lib/rails/rack/logger.rb:26:in call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in call' actionpack (5.2.2) lib/action_dispatch/middleware/remote_ip.rb:81:in call'
request_store (1.4.1) lib/request_store/middleware.rb:19:in call' actionpack (5.2.2) lib/action_dispatch/middleware/request_id.rb:27:in call'
rack (2.0.6) lib/rack/method_override.rb:22:in call' rack (2.0.6) lib/rack/runtime.rb:22:in call'
activesupport (5.2.2) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in call' actionpack (5.2.2) lib/action_dispatch/middleware/executor.rb:14:in call'
actionpack (5.2.2) lib/action_dispatch/middleware/static.rb:127:in call' rack (2.0.6) lib/rack/sendfile.rb:111:in call'
railties (5.2.2) lib/rails/engine.rb:524:in call' puma (3.12.0) lib/puma/configuration.rb:225:in call'
puma (3.12.0) lib/puma/server.rb:658:in handle_request' puma (3.12.0) lib/puma/server.rb:472:in process_client'
puma (3.12.0) lib/puma/server.rb:332:in block in run' puma (3.12.0) lib/puma/thread_pool.rb:133:in block in spawn_thread'

[nasim31]

I feel that there is a problem in placing the form short code in erb..

[nasim31]

Can you please send me the corresponding erb of this html form please..
form.txt

What I did in the code ??

erb-form.txt

[nasim31]

Did some changes. But There is no way to send the form.
Only this error after clicking submit button.
ActionController::RoutingError (No route matches [POST] "/"):

[nasim31]

I guess may be the issue with this ?