I have encountered the same problem, have you got it solved? Can you tell me the solution? Thanks

Hi

I also met the same problem---"native extesion class could not be found"

The problem is solved？

I think the reason is

" <extensions>

  <extensionID>XXXXXX</extensionID>

</extensions>“ in  "-app.xml"

the worker do not  konw the extensionID

....

In this article :

Adobe AIR * Using native extensions for Adobe AIR

.....................

Including the ANE file in your application’s library path

To compile an application that uses a native extension, include the ANE file in your library path.

Using the ANE file with Flash Builder

If your application uses a native extension, include the ANE file for the native extension in your library path. Then you can use Flash Builder to compile your ActionScript code.

Do the following steps, which use Flash Builder 4.5.1:

Change the filename extension of the ANE file from .ane to .swc. This step is necessary so that Flash Builder can find the file.

Select Project > Properties on your Flash Builder project.

Select the Flex Build Path in the Properties dialog box.

In the Library Path tab, select Add SWC....

Browse to the SWC file and select Open.

Select OK in the Add SWC... dialog box.

The ANE file now appears in the Library Path tab in the Properties dialog box.

Expand the SWC file entry. Double-click Link Type to open the Library Path Item Options dialog box.

In the Library Path Item Options dialog box, change the Link Type to External.

Now you can compile your application using, for example, Project > Build Project.

.......................

the error will be done

Unfortunately, it still does not work well！

Error: Error #3731: This feature is not available within this context.

  at flash.external::ExtensionContext$/_createExtensionContext()

  at flash.external::ExtensionContext$/createExtensionContext()

Run-Time Errors - Adobe ActionScript® 3 (AS3) API Reference

Hi,

Which platform are you using? You might be aware but ActionScript workers API isn't supported on mobile platforms.

-Nimisha