post icon

Silverlight: Unable to start Debugging. The Silverlight managed debugging package isn’t installed.

Due to a design change in the Silverlight 4 installer you may see the following dialog when you attempt to debug:

This is due to the fact that the installer causes any older developer runtime to be upgraded when a newer client runtime installer is executed. As a result, the debugging components are uninstalled.

To fix this, please re-install the latest Silverlight developer runtime which can be found at via the following FWLink: http://go.microsoft.com/fwlink/?LinkID=188039

A fix for this will be considered during the SL5 timeframe.

Thanks,

–Mike

22. Apr, 2010

21 Comments

Leave a comment
  1. Bob
    23. Apr, 2010 at 12:53 am #

    You had me at SL5 :)

  2. JC
    23. Apr, 2010 at 7:21 am #

    Hi Mike,

    Do you know of a way to obtain a browser’s proxy information using the Silverlight API? The BrowserInformation class doesn’t give me this information.

    cheers and keep the tips coming!

    John

  3. Dave
    23. Apr, 2010 at 7:43 am #

    Awesome! I’d spent a while trying to figure this out and following (bad) old advise regarding the silverlight_chainer. Thanks for posting this useful info

  4. admin
    23. Apr, 2010 at 11:25 am #

    Thanks everyone!

    JC – I’ll post your question to our SL team and let you know if I get an answer.

  5. JC
    24. Apr, 2010 at 12:19 am #

    Many thanks, Mike.

  6. Deep Singh
    24. Apr, 2010 at 4:15 am #

    Hi Mike,

    Good Stuff. Thanks for the post.

  7. Peter Gfader
    26. Apr, 2010 at 10:25 pm #

    I tried to install the Developer runtime but running the installer I get:

    Unable to install Silverlight.
    The same version of Silverlight is already installed.

    Thanks for help!!

    .peter.gfader.
    http://peitor.blogspot.com/
    http://twitter.com/peitor

  8. Snowman
    27. Apr, 2010 at 12:52 pm #

    Can you try uninstalling your current version of the runtime before installing the latest? Let me know if that fixes it. Thanks.

  9. Snowman
    27. Apr, 2010 at 12:53 pm #

    JC – I did not receive a response about the proxy info. My guess is that it’s not supported. Sorry.

  10. JC
    27. Apr, 2010 at 10:26 pm #

    Thanks anyway, Mike. I can ‘work around’ that apparent limitation by using COM automation, although that route can obviously be fraught with problems…

  11. Peter Gfader
    28. Apr, 2010 at 4:17 pm #

    Hi
    There are 2 registry keys that are important for Silverlight debugging

    Check
    * HKLM,SOFTWARE\Microsoft\Silverlight\Components\Debugging
    * HKLM\Software\Microsoft\.NETFramework\DbgpackShimPath

    on 64bit
    * HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Silverlight\Components\Debugging
    * HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework

    More here
    http://peitor.blogspot.com/2010/04/no-debugging-in-silverlight-4-with.html

  12. Javier Espinoza
    28. Apr, 2010 at 5:38 pm #

    Excellent.!!!! I can work!! now!!!!!

  13. mike
    30. Apr, 2010 at 12:18 pm #

    thank you, thank you,thank you!

  14. Evan
    30. Apr, 2010 at 9:33 pm #

    A fix is being considered? Do you have any idea how much time I lost today because I went to a Microsoft website that insisted I “upgrade” the client runtime, and then my Visual Studio quit working for running debug sessions.
    If you guys need a cost justification to more the consider the fix, I will send you an invoice for my wasted time today.

  15. Evan
    30. Apr, 2010 at 10:36 pm #

    Moderator, please ignore my previous comment. moment of frustration. At least I found this post eventually

  16. Nix
    03. May, 2010 at 12:37 pm #

    Thanks Fixed it for me. you need to federate this infom more, this will likely make a few people mad.

  17. Glen
    03. May, 2010 at 8:27 pm #

    Thank you Mike – back to work in seconds :-)

  18. Jonathan
    17. May, 2010 at 12:07 pm #

    Thanks to you and the gods of Google this fixed my issue. Appreciate it!

  19. Fabio
    21. May, 2010 at 5:16 am #

    Thank you.

  20. pavel
    11. Jun, 2010 at 1:22 pm #

    thanks, boss.

    MS makes it so easy to break their setup.

  21. Kaushik
    02. Feb, 2011 at 10:57 am #

    Thanks a lot. Fixed my issue. Appreciate it!!!