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An unknown item is declared as the root of your MXML document.Switch to source mode to correct it.

Apr 6, 2010 3:57 PM

In the "Flex in a Week" training series, every example I attempt to open in Design mode displays the error:

 

"An unknown item is declared as the root of your MXML document.Switch to source mode to correct it."

 

The problem has been posted numerous times, but I've yet to see an answer that describes how I can solve it. Again, I'm using the "Flex in a Week" examples exactly as downloaded from Adobe, no changes.

 

Appreciate a solution.

 

thanks,

jason

4035 Views   12 Replies   Latest reply: uldo, Sep 11, 2012 10:58 AM
 
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  • e2dev
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    1. e2dev,
    Apr 6, 2010 8:28 PM   in reply to visualplant3
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    Jason - what version of Flash Builder and the Flex in a Week files are you using? When Flex 4 and Flash Builder 4 were released at the end of March, a whole new version of Flex in a Week was launched (http://www.adobe.com/devnet/flex/videotraining/). This version requires that you use the official release version of Flash Builder (linked from that page). In other words, if you were using testing with Flex in a Week for Flex 4 beta, then you will need the Flash Builder 4 beta 2 version of the software. If you are using the new Flex in a Week series, then you will need the release version of Flash Builder. You can't mix and match. HTHs.

     
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  • visualplant3
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    2. visualplant3,
    Apr 6, 2010 9:28 PM   in reply to e2dev
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    I'm using the new "Flash Builder 4 Premium" downloaded from the link (http://www.adobe.com/devnet/flex/videotraining/) redirects to (http://www.adobe.com/cfusion/tdrc/index.cfm?product=flash%5Fbuilder). And I'm using the Flex in a Week files downloaded from that same page (http://www.adobe.com/devnet/flex/videotraining/). I can build new Flex projects in FB4 Premium without the error, but the examples projects that came with the video training series are erroring and prevent use of design mode at all.

     

    Thanks,

    Jason

     
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  • e2dev
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    3. e2dev,
    Apr 6, 2010 9:31 PM   in reply to visualplant3
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    Can you tell me which Day zip (or project zip) you have downloaded and which project is the problem?

     
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  • visualplant3
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    4. visualplant3,
    Apr 6, 2010 9:46 PM   in reply to e2dev
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    It's the "FiaW_Day1_ProjectArchive". Projects 1 - 4 and 6 all have the error, including both starter and solution projects.

    E.G.: ex1_01_starter ex1_02_solution et al.

     

    Note: The problem is occuring with the primary src .mxml file in each project.

     

    (Strangely, project 5 does not error)

     

    Thanks,

    Jason

     
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  • e2dev
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    5. e2dev,
    Apr 6, 2010 11:08 PM   in reply to visualplant3
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    Jason - I have downloaded the Day 1 zip and tested on two macs and a windows machine. I cannot replicate your problem; I do not see any error when switching between Source and Design mode in any of the projects. Can you copy-and-paste the code in one of the files that is erroring into a post so that I can see it?

     
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  • visualplant3
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    6. visualplant3,
    Apr 6, 2010 11:21 PM   in reply to e2dev
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    Although I closed and reopened the projects several times previously, I did so again minutes ago and the error is gone. I haven't changed anything otherwise. It's a mystery. Must be a bug, but for the moment, I cannot duplicate it from a known sequence, and frankly, don't want to! Thanks very much for investigating, and I'll post with more details if this occurs again.

     

    Jason

     
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  • e2dev
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    7. e2dev,
    Apr 6, 2010 11:33 PM   in reply to visualplant3
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    My pleasure. Glad you got it working.

     
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  • AlexCook
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    8. AlexCook,
    Nov 21, 2010 6:15 PM   in reply to visualplant3
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    This is a bug.  I had to close flex and re-open it.  Getting pretty tired of Flex :-)

     
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  • 7esign
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    9. 7esign,
    Jul 26, 2011 8:51 AM   in reply to AlexCook
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    I have the same thing happening on my MAC. I just got the CS5.5 Master which includes FB 4.5 and it happens on projects and it will not go away no matter how many times I restart Flex!

     

    Is there any config I can change? Maybe related to SDK4.5.1? Please help!

     

    Thank You,

     
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  • e2dev
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    10. e2dev,
    Jul 26, 2011 10:14 AM   in reply to 7esign
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    Is this happening on all your projects or only a particular one? Can you tell me exactly which project(s) you downloaded?

     
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  • 7esign
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    11. 7esign,
    Jul 26, 2011 10:22 AM   in reply to e2dev
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    It is happening on all except Hello World...Even on the Lynda.com exercise source files...Now also some of my projects are displaying square image with a little red X. Most of them are mobile projects, but even the Air based projects are acting up...

     

    Marcelo Assis

     
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  • uldo
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    12. uldo,
    Sep 11, 2012 10:58 AM   in reply to 7esign
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    just delete the files in C:\Users\USER\Adobe Flash Builder 4.6 .... you have to re-import all of your projects - but the error is gone.

     
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