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Revision as of 17:13, 17 May 2007 by 63.109.192.30 (Talk)

Flex and ActionScript Error Codes

One of the great things about working on the Flex development team is seeing how people create these amazing applications; things you never would have thought possible. However, the flip side of that is that when people are developing things you never would have thought possible, they get errors you never would have thought possible. This page is an attempt to capture and catalog Flex and ActionScript compiler and run-time errors, along with the environment in which they occur, and what it took to fix them.

Existing Documentation

Before you add an error to this page, please check out the existing error-code documentation. It may be covered already:


Run-time errors

Error code Description Solution or workaround
1009 TypeError - Cannot access a property or method of a null object reference When using modules, be careful using shared code between modules that share the same classes or assets. If those modules share managers, then the developer must be careful. One common mistake is to accidentally bring in Managers (PopUpManger, DragManager) in a module and use from another module. For more information, see http://thanksmister.com/?p=54.

If you get this error from clicking a cell an ItemRenderer, add the following line to the renderer's "override public function set data(...)":

super.data = value;

1030 VerifyError Make sure you are running the current version of the player.
1034 TypeError: Type Coercion failed: cannot convert class to class. This is a common error when two modules or SWFs try to share a class across ApplicationDomains.
1068 VerifyError: classname and classname Cannot be reconciled One developer who experienced this error reports that restarting the application server fixed the problem.
1151 A conflict exists with definition definition in namespace namespace The declaration of a variable of a certain type cannot be overridden to a different type in the same scope.
1502 A script has executed for longer than the default timeout period of 15 seconds. For Flex Charting, ensure that you're using unique category names in the category axis.
2032 HTTP request error The referenced resource does not exist or the swf is trying to access a file across a restricted domain.
2082 Connect failed because the object is already connected. If your application dies unexpectedly, it can leave the history LocalConnection in a hung state:
  • One workaround is to shut down all instances of the Flash Player, including all browsers, and Yahoo IM, then you should be all set.
  • A code-based workaround is as follows:
    If connecting to a named LocalConnection "A" fails, you can try setting up a temporary callback LocalConnection and then invoke a send() to connection "A". If the owning instance is running it receives the call to connection "A" and should ping back over the temporary connection and you'll know that the connect failure is legitimate because the owning player instance is running. If you don"t hear back after 5 seconds (magic number) the Player assumes that connection "A" is orphaned and cleans up the shared memory, and at this point you can retry your connect() and it should succeed.

Another cause of this error is using managers (or other singletons) within a module before they're loaded by the main application. There's a lengthy thread on this topic in flexcoders here: http://tech.groups.yahoo.com/group/flexcoders/message/63829

2137 Sandbox security violation Possible solutions include:
  SWF is not a loadable module If you load modules across domains, the target domain must implement a crossdomain.xml file with the appropriate permissions.
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