Class IllegalOperationError

Examples of illegal operation error exceptions include:

• A base class, such as DisplayObjectContainer, provides more functionality than a Stage can support(such as masks)
• Certain accessibility methods are called when the player is compiled without accessibility support
• The mms.cfg setting prohibits a FileReference action
• ActionScript tries to run a FileReference.browse() call when a browse dialog box is already open
• ActionScript tries to use an unsupported protocol for a FileReference object(such as FTP)
• Authoring-only features are invoked from a run-time player
• An attempt is made to set the name of a Timeline-placed object