Updated Rails to version 5.1.1. When launching the project, an error appeared:
/Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:94:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'activerecord-nulldb-adapter'. (Bundler::GemRequireError) Gem Load Error is: superclass mismatch for class Schema Backtrace for gem load error is: /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb/extensions.rb:37:in `<module:ActiveRecord>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb/extensions.rb:34:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/active_record/connection_adapters/nulldb_adapter.rb:10:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/active_record/connection_adapters/nulldb_adapter.rb:10:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb/core.rb:3:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb/core.rb:3:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb.rb:1:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/nulldb.rb:1:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/activerecord-nulldb-adapter.rb:1:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-nulldb-adapter-0.3.6/lib/activerecord-nulldb-adapter.rb:1:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:91:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:91:in `block (2 levels) in require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `each' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `block in require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `each' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler.rb:107:in `require' /Users/Colibri/Library/Mobile Documents/com~apple~CloudDocs/Projects/Project1/config/application.rb:7:in `<top (required)>' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:129:in `require' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:129:in `block in perform' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:126:in `tap' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:126:in `perform' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor/command.rb:27:in `run' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/command/base.rb:63:in `perform' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/command.rb:44:in `invoke' /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands.rb:16:in `<top (required)>' bin/rails:9:in `require' bin/rails:9:in `<main>' Bundler Error Backtrace: from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:90:in `block (2 levels) in require' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `each' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `block in require' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `each' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `require' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler.rb:107:in `require' from /Users/Colibri/Library/Mobile Documents/com~apple~CloudDocs/Projects/Project1/config/application.rb:7:in `<top (required)>' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:129:in `require' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:129:in `block in perform' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:126:in `tap' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands/server/server_command.rb:126:in `perform' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor/command.rb:27:in `run' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/command/base.rb:63:in `perform' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/command.rb:44:in `invoke' from /Users/Colibri/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.1.1/lib/rails/commands.rb:16:in `<top (required)>' from bin/rails:9:in `require' from bin/rails:9:in `<main>' Swears as I understood this gem: https://rubygems.org/gems/activerecord-nulldb-adapter/
How to fix the situation?
