#### Core Ruby Errors
ArgumentError:
ArgumentError (
IndexError:
IndexError (
LoadError:
LoadError (
LocalJumpError:
LocalJumpError (
NameError:
NameError (
NoMethodError:
NoMethodError (
NotImplementedError:
NotImplementedError (
RangeError:
RangeError (
RuntimeError:
RuntimeError (
ScriptError:
ScriptError (
SecurityError:
SecurityError (
StandardError:
StandardError (
SyntaxError:
SyntaxError (
SystemExit:
SystemExit (
TypeError:
TypeError (
ZeroDivisionError:
ZeroDivisionError (

#### Ruby on Rails Errors
ActionController::RoutingError
ActionController::InvalidAuthenticityToken
ActionController::ParameterMissing
ActionController::UnknownFormat
ActionController::BadRequest
ActionController::UrlGenerationError
ActionController::RedirectBackError
ActionController::InvalidCrossOriginRequest
ActiveRecord::RecordNotFound
ActiveRecord::RecordInvalid
ActiveRecord::StatementInvalid
ActiveRecord::RecordNotUnique
ActiveRecord::ConnectionTimeoutError
ActiveRecord::SerializationTypeMismatch
ActiveRecord::Deadlocked
ActiveRecord::SubclassNotFound
ActiveModel::ForbiddenAttributesError
ActiveSupport::MessageVerifier::InvalidSignature
ActiveSupport::DeprecationException

#### Database & ORM Errors (ActiveRecord, PostgreSQL, MySQL, SQLite)*
PG::ConnectionBad
PG::UndefinedTable
PG::UndefinedColumn
PG::SyntaxError
PG::UniqueViolation
PG::CheckViolation
PG::ForeignKeyViolation
PG::NotNullViolation
PG::InvalidTextRepresentation
PG::CharacterNotInRepertoire
Mysql2::Error
Mysql2::TimeoutError
SQLite3::BusyException
SQLite3::ConstraintException

#### Rack Middleware & Web Server Errors (Puma, Unicorn, Thin, WEBrick)
Rack::Timeout::RequestTimeoutException
Rack::Lint::LintError
Rack::QueryParser::ParameterTypeError
Puma::HttpParserError
Unicorn::ClientShutdown
Thin::ConnectionError
WEBrick::HTTPStatus::InternalServerError

#### JSON, Serialization, and Parsing Errors*
JSON::ParserError
JSON::GeneratorError
Oj::ParseError
Oj::GeneratorError

#### Network & HTTP Client Errors
SocketError
EOFError
OpenSSL::SSL::SSLError
Timeout::Error
Net::ReadTimeout
Net::OpenTimeout
Net::HTTPBadResponse
Net::HTTPHeaderSyntaxError

#### File Handling & System Errors
Errno::ENOENT
Errno::EACCES
Errno::ECONNREFUSED
Errno::ETIMEDOUT
Errno::EPIPE
Errno::EMFILE
SystemCallError

#### Authentication & Security Errors*
Devise::Unauthorized
JWT::DecodeError
JWT::ExpiredSignature
BCrypt::Errors::InvalidHash

#### Threading & Concurrency Errors
ThreadError
FiberError
Mutex::LockError

#### View Rendering Errors
ActionView::Template::Error
ActionView::MissingTemplate
ActionView::MissingPartial
ActionView::Template::Handlers::ERB::ERBError
ActionView::SyntaxErrorInTemplate
ActionView::Template::Handlers::Builder::TemplateError
ActionView::Helpers::NumberHelper::InvalidNumberError
ActionView::TemplateError