Hierarch and usage
NoMemoryError
Raised when memory
allocation fails.
ScriptError
Superclass for errors raised when a script can
not be executed
ScriptError Hierarch
LoadError
Raised when a file required fails to load
NotImplementedError
Raised when a feature is not
implemented on the current platform
SyntaxError
Raised when encountering Ruby code with an invalid
syntax
SignalException!SignalException!
Raised when a signal is received
SignalException
SignalException Hierarch
Interrupt
Raised with the interrupt signal is received, typically
because the user pressed on Control-C
StandardError
The most standard error types are subclasses of StandardError
StandardError Hierarch
ArgumentError
Raised when the arguments are
wrong
IndexError
Raised when the given index is
invalid.
StopIteration < IndexError
Raised to stop the iteration, in particular by
Enumerator#next
IOError
Raised when an IO operation fails.
EOFError < IOError
Raised by some IO operations when
reaching the end of file, nil for example
LocalJumpError
Raised when Ruby can't yield as
requested
NameError
Raised when a given name is invalid or
undefined
NoMethodError < NameError
Raised when a method is called on a
receiver which doesn't have it
defined
RangeError
Raised when a given numerical value is
out of range
FloatDomainError < RangeError
Raised when attempting to
convert special float values
RegexpError
Raised when given an invalid regexp
expression.
RuntimeError *default for raise
A generic error class raised when an
invalid operation is attempted.
SecurityError
Raised when attempting a potential
unsafe operation, typically when the
$SAFE level is raised above 0.
SystemCallError
SystemCallError is the base class for all low-
level platform-dependent errors.
SystemStackError
Raised in case of a stack overflow.
ThreadError
Raised when an invalid operation is
attempted on a thread.
TypeError
Raised when encountering an
object that is not of the expected type.
ZeroDivisionError
Raised when attempting to divide
an integer by 0
Raised by exit to initiate the
termination of the script.
fatal – impossible to rescue!