Ruby on rails RubyonRails:LoadError:无法加载此类文件--paypal express

当我这样做的时候

rake db:migrate

它完全失败了。以下是日志：

$ rake db:migrate
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/object/duplicable.rb:82: warning: BigDecimal.new is deprecated; use BigDecimal() method instead.
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/values/time_zone.rb:282: warning: circular argument reference - now
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Fixnum is deprecated
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Bignum is deprecated
rake aborted!
SystemStackError: stack level too deep
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:3:in `map'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:3:in `<module:RestClient>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:1:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient.rb:7:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/rest_client.rb:2:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/paypal-express-0.8.1/lib/paypal.rb:6:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/paypal-express-0.8.1/lib/paypal/express.rb:1:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:95:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:95:in `rescue in block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:72:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:65:in `each'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:65:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler.rb:114:in `require'
/home/ubuntu/myproject/RubyOnRails/config/application.rb:7:in `<top (required)>'
/home/ubuntu/myproject/RubyOnRails/Rakefile:4:in `require'
/home/ubuntu/myproject/RubyOnRails/Rakefile:4:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `eval'
/home/ubuntu/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `<main>'

Caused by:
LoadError: cannot load such file -- paypal-express
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:81:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:76:in `each'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:76:in `block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:65:in `each'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:65:in `require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler.rb:114:in `require'
/home/ubuntu/myproject/RubyOnRails/config/application.rb:7:in `<top (required)>'
/home/ubuntu/myproject/RubyOnRails/Rakefile:4:in `require'
/home/ubuntu/myproject/RubyOnRails/Rakefile:4:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/home/ubuntu/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `eval'
/home/ubuntu/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `<main>'
(See full trace by running task with --trace)

$rake数据库：迁移
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/object/duplicable.rb:82:警告：bigdecim.new不推荐使用；请改用BigDecimal（）方法。
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/values/time\u zone.rb:282:警告：循环参数引用-现在
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:121:警告：常量：：Fixnum不推荐使用
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:121:警告：常量：：Bignum不推荐使用
雷克流产了！
SystemStackError:堆栈级别太深
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/core\u ext/numeric/conversions.rb:131:in `块（两级）in'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:3:在“地图”中
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:3:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient/version.rb:1:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:214:in'load\u dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/restclient.rb:7:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:214:in'load\u dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/rest-client-2.0.2/lib/rest\u client.rb:2:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:214:in'load\u dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/paypal-express-0.8.1/lib/paypal.rb:6:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'block in require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:214:in'load\u dependency'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-4.0.2/lib/active\u support/dependencies.rb:229:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/paypal-express-0.8.1/lib/paypal/express.rb:1:in`'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:95:in'require'
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:95:“请求中的块中救援”
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bundler-1.17.3/lib/bundler/runtime.rb:72:in'block in require'
/home/ubuntu/.r
sudo mysql -u root -p <db name> < /home/ubuntu/my_site_data.sql