# phpman > perldoc > Specio::Exception

## NAME
    [Specio::Exception](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AException/markdown) - An exception class for type constraint failures

## VERSION
    version 0.47

## SYNOPSIS
      use [Try::Tiny](https://www.chedong.com/phpMan.php/perldoc/Try%3A%3ATiny/markdown);

      try {
          $type->validate_or_die($value);
      }
      catch {
          if ( $_->isa('[Specio::Exception](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AException/markdown)') ) {
              print $_->message, "\n";
              print $_->type->name, "\n";
              print $_->value, "\n";
          }
      };

## DESCRIPTION
    This exception class is thrown by Specio when a type check fails. It emulates the
    [Throwable::Error](https://www.chedong.com/phpMan.php/perldoc/Throwable%3A%3AError/markdown) API, but doesn't use that module to avoid adding a dependency on Moo.

## API
    This class provides the following methods:

  $exception->message
    The error message associated with the exception.

  $exception->stack_trace
    A [Devel::StackTrace](https://www.chedong.com/phpMan.php/perldoc/Devel%3A%3AStackTrace/markdown) object for the exception.

  $exception->type
    The type constraint object against which the value failed.

  $exception->value
    The value that failed the type check.

  $exception->as_string
    The exception as a string. This includes the method and the stack trace.

## OVERLOADING
    This class overloads stringification to call the "as_string" method.

## SUPPORT
    Bugs may be submitted at <<https://github.com/houseabsolute/Specio/issues>>.

    I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".

## SOURCE
    The source code repository for Specio can be found at <<https://github.com/houseabsolute/Specio>>.

## AUTHOR
    Dave Rolsky <<autarch@urth.org>>

## COPYRIGHT AND LICENSE
    This software is Copyright (c) 2012 - 2021 by Dave Rolsky.

    This is free software, licensed under:

      The Artistic License 2.0 (GPL Compatible)

    The full text of the license can be found in the LICENSE file included with this distribution.