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Ruby Exceptions

Ruby 3.x60 codes

Built-in exception hierarchy, Errno namespace, and stdlib errors

Showing 60 of 60 errors

Code	Message	Severity	Tier
Exception	Base class for all Ruby exceptions	FATAL	Common	→
StandardError	Base class for most rescuable errors	ERROR	Notable	→
RuntimeError	Generic runtime error	ERROR	Notable	→
NoMethodError	Undefined method called on object	FATAL	Common	→
ArgumentError	Wrong number or type of arguments	ERROR	Notable	→
TypeError	Operation applied to wrong type	ERROR	Notable	→
NameError	Undefined name or constant	ERROR	Notable	→
LoadError	File or gem could not be loaded	FATAL	Common	→
SyntaxError	Ruby code has invalid syntax	FATAL	Common	→
ScriptError	Non-rescuable script-level error	FATAL	Common	→
NotImplementedError	Feature not implemented on this platform	ERROR	Notable	→
ZeroDivisionError	Integer division by zero	ERROR	Notable	→
RangeError	Numeric value out of valid range	ERROR	Notable	→
FloatDomainError	Float value outside mathematical domain	ERROR	Notable	→
Math::DomainError	Math function input outside its domain	ERROR	Notable	→
IndexError	Index out of range or invalid	ERROR	Notable	→
KeyError	Hash key not found	ERROR	Notable	→
StopIteration	External iterator has no more values	INFO	Critical	→
IOError	IO operation failed on closed or invalid stream	ERROR	Notable	→
EOFError	End of file reached unexpectedly	WARNING	Critical	→
FrozenError	Attempt to modify a frozen object	ERROR	Notable	→
EncodingError	String encoding problem	ERROR	Notable	→
Encoding::InvalidByteSequenceError	Byte sequence is invalid in source encoding	ERROR	Notable	→
Encoding::UndefinedConversionError	Character has no mapping in target encoding	ERROR	Notable	→
Encoding::CompatibilityError	Encodings are incompatible for concatenation	ERROR	Notable	→
Encoding::ConverterNotFoundError	No converter available between encodings	ERROR	Critical	→
RegexpError	Invalid regular expression	ERROR	Notable	→
LocalJumpError	Invalid use of break, return, or next outside block	ERROR	Notable	→
FiberError	Invalid Fiber operation	ERROR	Notable	→
ThreadError	Invalid Thread or Mutex operation	ERROR	Notable	→
NoMemoryError	Memory allocation failed	FATAL	Common	→
SystemStackError	Stack overflow from infinite recursion	FATAL	Common	→
SystemExit	Program exit requested via exit or exit!	INFO	Critical	→
SignalException	OS signal received by the process	FATAL	Common	→
Interrupt	Ctrl+C pressed — keyboard interrupt	FATAL	Common	→
SystemCallError	OS system call returned an error	ERROR	Notable	→
UncaughtThrowError	throw called with no matching catch	ERROR	Notable	→
ClosedQueueError	Operation on a closed Queue	ERROR	Notable	→
Errno::ENOENT	No such file or directory	ERROR	Notable	→
Errno::EACCES	Permission denied	ERROR	Notable	→
Errno::EEXIST	File or directory already exists	WARNING	Critical	→
Errno::ENOTEMPTY	Directory not empty	WARNING	Critical	→
Errno::ENOTDIR	Path component is not a directory	ERROR	Notable	→
Errno::ECONNREFUSED	Connection refused by remote host	ERROR	Notable	→
Errno::ECONNRESET	Connection reset by peer	ERROR	Notable	→
Errno::ETIMEDOUT	Connection or operation timed out	ERROR	Notable	→
Errno::EADDRINUSE	Address already in use	ERROR	Notable	→
Errno::EPIPE	Broken pipe — reader has closed	WARNING	Critical	→
SocketError	Socket or hostname resolution failure	ERROR	Notable	→
OpenSSL::SSL::SSLError	TLS/SSL handshake or certificate failure	ERROR	Notable	→
Net::HTTPError	HTTP response indicated an error	ERROR	Notable	→
OpenURI::HTTPError	HTTP error from OpenURI::open	ERROR	Notable	→
Timeout::Error	Operation exceeded the time limit	ERROR	Notable	→
JSON::ParserError	Invalid JSON input	ERROR	Notable	→
CSV::MalformedCSVError	CSV input is not valid	ERROR	Notable	→
URI::InvalidURIError	String is not a valid URI	ERROR	Notable	→
FrozenError	Cannot modify a frozen object	ERROR	Common	→
NoMatchingPatternError	Pattern matching found no match (Ruby 3.x)	ERROR	Common	→
FiberError	Invalid Fiber operation	ERROR	Notable	→
Encoding::ConversionError	String encoding conversion failed	ERROR	Common	→