| 123456789101112131415161718192021 | Smalltalk createPackage: 'Helios-Exceptions'!Error subclass: #HLError	instanceVariableNames: ''	package: 'Helios-Exceptions'!!HLError commentStamp!I am the abstract superclass of all Helios-specific errors.!HLError subclass: #HLChangeForbidden	instanceVariableNames: ''	package: 'Helios-Exceptions'!!HLChangeForbidden commentStamp!I get signaled when a (often user) requested change is forbidden. A confirmation message can then be displayed to the user.See `HLModel >> withChangesDo:`.!HLError subclass: #HLListItemNotFound	instanceVariableNames: ''	package: 'Helios-Exceptions'!!HLListItemNotFound commentStamp!I get signaled by a `HLListWidget` when a non-existing item in the list is activated.!
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