Flash Builder launch failed - invalid application descriptor: Unknown namespace

Question

I\'m having difficulty getting a Flex mobile project to run on my machine. When I try and run the project I get the following error:

Process terminate

Answer 1

Your problem is just you have indicate an unavailable AIR SDK version (16) for your current used Flex SDK (4.6.0).

So to avoid such problem you can :

• 1. Use the installed AIR SDK version with your Flex 4.6.0 SDK which is usually 3.x ( if you didn't have upgraded it ).

• 2. Install the AIR SDK version 16 for your Flex 4.6.0 SDK.

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How ?

1. You can get the installed version of the AIR SDK of your Flex SDK by running the AIR Debug Launcher (ADL) exe which is : "C:\Program Files\Adobe\Adobe Flash Builder 4.7 (64 Bit)\sdks\4.6.0\bin\adl.exe" using cmd.exe :

You can also get it more simply when creating a new project :

In my case it's : 3.1.0, so in my project-app.xml, I should put :

<application xmlns="http://ns.adobe.com/air/application/3.1">

2. To upgrade the AIR SDK version of a Flex SDK, we do :

• a. Make a backup ( if you want ) of your current SDK dir, which is in your case here : "C:\Program Files\Adobe\Adobe Flash Builder 4.7 (64 Bit)\sdks\4.6.0". You can in any time download any Flex SDK version from Sourceforge.

• b. Download your desired AIR SDK ( version 16 for your case ) from Adobe here, the SDK not the runtime of course, and you don't need the compiler also, just the SDK.

• c. Unzip the downloaded file ( a zip archive ) and then copy its content and paste it into the Flex SDK dir with overwriting any existing content.

• d. Finally, open Flash Builder and create a new project and select your appropriate AIR SDK :

In my case, I installed many combinations of Flex and AIR SDKs.

Hope that can help.