norse-blue/php-extensible-objects

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title: Exceptions
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permalink: /exceptions
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# Exceptions
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The following is a list of the different exceptions that are used within this package.

## ClassNotExtensionMethodException

Exception thrown when trying to register an extension method that does not implement the ExtensionMethod contract.

## ExtensionGuardedException

Exception thrown when trying to unregister or replace a guarded extension method.

## ExtensionNotCallableException

Exception thrown when trying to register an extension method that is not callable.

## ExtensionNotFoundException

Exception thrown when trying to get a nonexistent extension from the extension collection.

## MethodDefinedInClassException

Exception thrown when trying to register an extension method with the same name as a defined class method.